Abuse Potential
Conditions
Keywords
Neurontin, Oxycodone, Abuse Liability, Gabapentin
Brief summary
This will be a randomized, double-blind, double-dummy, placebo- and active-controlled, 6 treatment, 6-period crossover single-dose, Williams square design study in healthy male and/or female adult, non-drug-dependent recreational opioid users.
Detailed description
The study includes Screening, a Qualification Phase consisting of a Naloxone Challenge and Drug Discrimination crossover study, a Treatment Phase and Follow-up. Following successful completion of the Qualification Phase the participants will be enrolled in the Treatment phase. The Treatment Phase is a randomized, double-blind, double dummy, placebo- and active controlled, 6 treatment, 10-sequence, 6 period crossover, single-dose, Williams square design study in healthy male and/or female adult, non drug-dependent recreational users. On Day 1 of each of the Treatment Phase 6 periods, which will be separated by a washout of at least 14 days, participants will receive an oral dose of either gabapentin 600 mg or 1200 mg alone, or concomitantly with a 20 mg dose of oxycodone HCl or 20 mg monotherapy of oxycodone HCl or a placebo. Study treatments will be administered under fasted conditions (overnight fast and no food until 4 hours after dosing). Water will be allowed without restriction until 1 hour prior to dosing and 1 hour after dosing.
Interventions
Participants will receive a single oral dose of gabapentin 600 mg and a placebo that looks like oxycodone HCl
Participants will receive a single oral dose of gabapentin 1200 mg and a placebo that looks like oxycodone HCl
DRUGgabapentin 600 mg and oxycodone HCl 20 mg
Participants will receive a single oral dose of gabapentin 600 mg and oxycodone HCl 20 mg
DRUGgabapentin 1200 mg and oxycodone HCl 20 mg
Participants will receive a single oral dose of gabapentin 1200 mg and oxycodone HCl 20 mg
DRUGoxycodone HCl 20 mg
Participants will receive a single oral dose of oxycodone HCl 20 mg and a placebo that looks like gabapentin
DRUGplacebo
Participants will receive a single oral dose of a placebo that looks like gabapentin and a placebo that looks like oxycodone HCl
Sponsors
Viatris Specialty LLC
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to 55 Years
Healthy volunteers
Yes
Inclusion criteria
1. Male and female participants must be 18 to 55 years of age, inclusive, at the time of screening. Participants must meet reproductive criteria as outlined in the protocol. 2. Male and female participants who are overtly healthy. Healthy is defined as no clinically relevant abnormalities identified by a detailed medical history, complete physical examination, vital signs, 12-lead ECG, and/or clinical laboratory tests. 3. Participants must have drug abuse experience with opioids; ie, must have used opioids for non-therapeutic purposes (ie, for psychoactive effects) on at least 10 occasions within the last year and at least once in the 8 weeks before the Screening Visit (Visit 1). 4. Participants must satisfactorily complete both the Naloxone Challenge and the Drug Discrimination. 5. Participants who are willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations, and other study procedures. 6. Body mass index (BMI) of 17.5 to 34 kg/m2, inclusive; and a total body weight ≥50 kg (110 lb). 7. Capable of giving signed informed consent as described in the protocol, which includes compliance with the requirements and restrictions listed in the informed consent document (ICD) and in this protocol.
Exclusion criteria
1. Current or past diagnosis of any type of drug dependence within the past year. Diagnosis of substance and/or alcohol dependence (excluding caffeine and nicotine) will be assessed by the Investigator using the Diagnostic and Statistical Manual of Mental Disorders-IV (DSM-IV) criteria performed at Screening. Current drug use will be allowed if the candidate can produce a negative urine sample and are free of any signs/symptoms of withdrawal. The candidate will be informed if they have a positive breathalyzer test. 2. Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurological, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at the time of dosing). 3. Any condition possibly affecting drug absorption (eg, gastrectomy) excluding cholecystectomy within 1 year prior to study. 4. Abnormal baseline EtCO2 \<35mm Hg or \>45 mm Hg. 5. Clinical or laboratory evidence of active hepatitis A infection or a history of human immunodeficiency virus (HIV) infection, hepatitis B, or hepatitis C, and/or positive testing for HIV, hepatitis B surface antigen (HBsAg), hepatitis B core antibody (HBcAb), or hepatitis C antibody (HCVAb). 6. Participants with active suicidal ideation or suicidal behavior within 5 years prior to Screening as determined through the use of the Columbia Suicide Severity Rating Scale (C-SSRS) or active ideation identified at Screening or on Day 0. 7. Participants with any history of sleep apnea, myasthenia gravis or glaucoma. 8. Other acute or chronic medical or psychiatric condition including recent (within the past year) or active suicidal ideation or behavior or laboratory abnormality that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results and, in the judgment of the investigator, would make the participant inappropriate for entry into this study. 9. Use of prescription or nonprescription drugs and dietary supplements within 7 days or 5 half lives (whichever is longer) prior to the first dose of investigational product. (Refer to Section 6.5 for additional details). 10. Herbal supplements, herbal medications and hormone replacement therapy must be discontinued at least 28 days prior to the first dose of study medication. 11. Previous administration with an investigational drug within 30 days (or as determined by the local requirement) or 5 half lives (whichever is longer) preceding the first dose of investigational product used in this study. 12. Positive urine drug screen (UDS) for substances of abuse at each admission in Qualification and Treatment Phase, excluding tetrahydrocannabinol (THC). If a participant presents with a positive UDS excluding THC at any admission or any visit, the investigator, at his/her discretion, may reschedule a repeat of UDS until the UDS is negative, excluding THC, before the participate is permitted to participate in any phase of the study. 13. Unable to abstain from using THC during the Qualification and Treatment Phase of the study. 14. Has participated in, is currently participating in, or is seeking treatment for substance and/or alcohol related disorders (excluding nicotine and caffeine). 15. Has a positive alcohol breathalyzer or urine test at each admission to the study center during Qualification and Treatment Phases. Positive results may be repeated and/or participants re scheduled at the Investigator's discretions. 16. Participants are heavy smokers or users of other types of nicotine products (\>20 cigarettes equivalents per day). 17. Participants are unable to abstain from smoking for at least 2 hours before and at least 8 hours after study drug administration. 18. Screening sitting blood pressure (BP) \>=140 mm Hg (systolic) or \>=90 mm Hg (diastolic), following at least 5 minutes rest. If BP is \>=140 mm Hg (systolic) or \>=90 mm Hg (diastolic), the BP should be repeated 2 more times and the average of the 3 BP values should be used to determine the participant's eligibility. Repeated BP tests should be spaced at least 5 minutes apart. 19. Baseline (screening) 12 lead electrocardiogram (ECG) that demonstrates clinically relevant abnormalities that may affect participant safety or interpretation of study results (eg, baseline corrected QT (QTc) interval as determined by the Fridericia method (QTcF) \>450 msec, complete left bundle branch block \[LBBB\], signs of an acute or indeterminate age myocardial infarction, ST T interval changes suggestive of myocardial ischemia, second or third degree atrioventricular \[AV\] block, or serious bradyarrhythmias or tachyarrhythmias). If the baseline uncorrected QT interval is \>450 msec, this interval should be rate corrected using the Fridericia method and the resulting QTcF should be used for decision making and reporting. If QTcF exceeds 450 msec, or QRS exceeds 120 msec, the ECG should be repeated 2 more times and the average of the 3 QTcF or QRS values should be used to determine the participant's eligibility. Computer interpreted ECGs should be overread by a physician experienced in reading ECGs before excluding participants. 20. Participants with ANY of the following abnormalities in clinical laboratory tests at screening, as assessed by the study specific laboratory and confirmed by a single repeat test, if deemed necessary: * Aspartate aminotransferase (AST) or alanine aminotransferase (ALT) level \>=1.5 × upper limit of normal (ULN); * Total bilirubin level \>=1.5 × ULN; participants with a history of Gilbert's syndrome may have direct bilirubin measured and would be eligible for this study provided the direct bilirubin level is \<= ULN. 21. Blood donation (excluding plasma donations) of approximately 1 pint (500 mL) or more within 60 days prior to dosing. 22. History of sensitivity to heparin or heparin induced thrombocytopenia. 23. Unwilling or unable to comply with the criteria in the Lifestyle Considerations section of this protocol. 24. History of hypersensitivity to gabapentin or oxycodone or any of the components in the formulation of the study products. 25. Investigator site staff members directly involved in the conduct of the study and their family members, site staff members otherwise supervised by the investigator, or Sponsor employees, including their family members, directly involved in the conduct of the study.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Bipolar Visual Analog Scale (VAS) for Drug Liking Maximum Effect (Emax). | up to 48 hours after treatments | Drug liking assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Bipolar VAS for Drug Liking: Area Under the Effect Curve From Time 0 to the Last Available Data (AUEClast) | Up to 48 hours after treatments (Assessments were made at the following timepoints after each treatment: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Area under the effect-time profile from time 0 to the time of the last available data for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking |
| Bipolar VAS for Drug Liking: Area Under the Effect Curve to 1 Hour (AUEC1) | Up to 1 hour post-dose (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, and 1 hour) | Area under the effect-time profile from time 0 to 1 hour post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking |
| Bipolar VAS for Drug Liking: Area Under the Effect Curve to 2 Hours (AUEC2) | Up to 2 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, and 2 hours) | Area under the effect-time profile from time 0 to 2 hours post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking |
| Bipolar VAS for Drug Liking: Area Under the Effect Curve to 3 Hours (AUEC3) | up to 3 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, and 3 hours) | Area under the effect-time profile from time 0 to 3 hours post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking |
| Bipolar VAS for Drug Liking: Area Under the Effect Curve to 4 Hours (AUEC4) | Up to 4 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, and 4 hours) | Area under the effect-time profile from time 0 to 4 hours post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking |
| Bipolar VAS for Drug Liking: Area Under the Effect Curve to 8 Hours (AUEC8) | Up to 8 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours) | Area under the effect-time profile from time 0 to 8 hours post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking |
| Unipolar VAS for High - Maximum Effect (Emax) | up to 48 hours after treatments | Maximum effect on the 100 mm visual analog scale for the question I am feeling high where 0 = not at all and 100 = extremely |
| Unipolar VAS for High: Time to Maximum Effect (TEmax) | up to 48 hours after treatments | Time after dosing when the maximum effect for High VAS is reached |
| Area Under the Effect Curve for High VAS (AUEClast) | Up to 48 hours after treatments (Assessments were made at the following timepoints after each treatment: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Area under the effect-time profile from time 0 to the time of the last available data for the High visual analog scale which measures on a 100 mm visual analog scale the subject's response to the question I am feeling high where 0 = not at all and 100 =extremely |
| Bipolar VAS for Take Drug Again | Up to 48 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 24, 36, and 48 hours) | 100 mm visual analog scale at 24, 36, and 48 hours post-dose for the question I would take this drug again where 0 = definitely not, 50 = neutral, and 100 = definitely so. The data from the 24, 36, and 48 hours postdose measurements were combined into a single overall model-adjusted value for 24 to 48 hours post-treatment timeframe by estimation from a mixed model with treatment, period, treatment sequence, time, and treatment\*time as fixed effects, subject nested within sequence as a random effect. The compound symmetric covariance matrix was employed. Data from all time points were included |
| Bipolar VAS for Overall Drug Liking | Up to 48 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 24, 36, and 48 hours) | 100 mm visual analog scale at 24, 36, and 48 hours post-dose for the question Overall, my liking for this drug is where 0 = definitely not, 50 = neutral, and 100 = definitely so. The data from the 24, 36, and 48 hours postdose measurements were combined into a single overall model-adjusted value for 24 to 48 hours post-treatment timeframe by estimation from a mixed model with treatment, period, treatment sequence, time, and treatment\*time as fixed effects, subject nested within sequence as a random effect. The compound symmetric covariance matrix was employed. Data from all time points were included |
| Unipolar VAS for Good Drug Effect | up to 48 hours after treatments | 100 mm visual analog scale for the question At this moment, I can feel good drug effects where 0 = not at all and 100 = extremely |
| Bipolar VAS for Drug Liking - Time to Maximum Effect (TEmax) | up to 48 hours after treatments | Time after dosing when the maximum effect for Drug Liking VAS is reached |
| Unipolar VAS for Any Drug Effect | up to 48 hours after treatments | 100 mm visual analog scale for the question At this moment, I can feel any drug effects where 0 = not at all and 100 = extremely |
| Cmax of Gabapentin | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Maximum plasma concentration of gabapentin |
| Tmax of Gabapentin | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Time when the maximum concentration of gabapentin is reached |
| AUCinf of Gabapentin | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Area under the plasma concentration/time curve from time 0 extrapolated to infinity time of gabapentin |
| AUClast of Gabapentin | Up to 48 hours after treatment (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Area under the plasma concentration/time profile from time 0 to the time of the last quantifiable concentration of gabapentin |
| Half-life (t½) of Gabapentin | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Half-life (t½) of gabapentin |
| Cmax of Oxycodone | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Maximum plasma concentration of Oxycodone |
| Tmax of Oxycodone | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Time when the maximum concentration of Oxycodone is reached |
| AUCinf of Oxycodone | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Area under the plasma concentration/time curve from time 0 extrapolated to infinity time of Oxycodone |
| AUClast of Oxycodone | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Area under the plasma concentration/time profile from time 0 to the time of the last quantifiable concentration of Oxycodone |
| Half-life (t½) of Oxycodone | Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours) | Half-life (t½) of Oxycodone |
| Unipolar VAS for Bad Drug Effect | up to 48 hours after treatments | 100 mm visual analog scale for the question At this moment, I can feel bad drug effects where 0 = not at all and 100 = extremely |
Countries
United States
Participant flow
Pre-assignment details
Subjects were entered into a Qualification phase involving a naloxone challenge test (to exclude subjects who were opioid dependent) and a drug discrimination test (to confirm they can tell the difference between oxycodone and placebo). Only subjects who passed the tests in the Qualification phase were randomized into the Treatment phase where they received the 6 different single dose study treatments, each separated by a washout of at least 4 days, in the order specified for Sequences 1-6 below
Participants by arm
| Arm | Count |
|---|---|
| Randomized Population All participants who were randomized to a treatment sequence in the Treatment Phase. | 54 |
| Total | 54 |
Baseline characteristics
| Characteristic | Randomized Population |
|---|---|
| Age, Continuous | 33.3 Years STANDARD_DEVIATION 8.41 |
| Ethnicity (NIH/OMB) Hispanic or Latino | 12 Participants |
| Ethnicity (NIH/OMB) Not Hispanic or Latino | 42 Participants |
| Ethnicity (NIH/OMB) Unknown or Not Reported | 0 Participants |
| Race (NIH/OMB) American Indian or Alaska Native | 0 Participants |
| Race (NIH/OMB) Asian | 0 Participants |
| Race (NIH/OMB) Black or African American | 35 Participants |
| Race (NIH/OMB) More than one race | 4 Participants |
| Race (NIH/OMB) Native Hawaiian or Other Pacific Islander | 1 Participants |
| Race (NIH/OMB) Unknown or Not Reported | 1 Participants |
| Race (NIH/OMB) White | 13 Participants |
| Region of Enrollment United States | 54 participants |
| Sex: Female, Male Female | 16 Participants |
| Sex: Female, Male Male | 38 Participants |
Adverse events
| Event type | EG000 affected / at risk | EG001 affected / at risk | EG002 affected / at risk | EG003 affected / at risk | EG004 affected / at risk | EG005 affected / at risk |
|---|---|---|---|---|---|---|
| deaths Total, all-cause mortality | 0 / 53 | 0 / 52 | 0 / 51 | 0 / 52 | 0 / 52 | 0 / 52 |
| other Total, other adverse events | 0 / 53 | 4 / 52 | 0 / 51 | 2 / 52 | 4 / 52 | 2 / 52 |
| serious Total, serious adverse events | 0 / 53 | 0 / 52 | 0 / 51 | 0 / 52 | 0 / 52 | 0 / 52 |
Outcome results
Primary
Bipolar Visual Analog Scale (VAS) for Drug Liking Maximum Effect (Emax).
Drug liking assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking
Time frame: up to 48 hours after treatments
Population: The analysis population was the modified completer population which included subjects who completed all 6 treatment periods but excluded those identified during data review as having maximum Drug Liking scores that were similar for all 6 treatments or who had high placebo responses
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar Visual Analog Scale (VAS) for Drug Liking Maximum Effect (Emax). | 54.89 Score on a 100 mm scale | Standard Error 2.116 |
| Oxycodone HCl 20 mg Single Dose | Bipolar Visual Analog Scale (VAS) for Drug Liking Maximum Effect (Emax). | 87.40 Score on a 100 mm scale | Standard Error 3.156 |
| Gabapentin 600 mg Single Dose | Bipolar Visual Analog Scale (VAS) for Drug Liking Maximum Effect (Emax). | 57.89 Score on a 100 mm scale | Standard Error 3.142 |
| Gabapentin 1200 mg Single Dose | Bipolar Visual Analog Scale (VAS) for Drug Liking Maximum Effect (Emax). | 63.62 Score on a 100 mm scale | Standard Error 3.334 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar Visual Analog Scale (VAS) for Drug Liking Maximum Effect (Emax). | 88.43 Score on a 100 mm scale | Standard Error 3.216 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar Visual Analog Scale (VAS) for Drug Liking Maximum Effect (Emax). | 92.17 Score on a 100 mm scale | Standard Error 2.713 |
Comparison: The sensitivity and integrity of the study was validated by comparing the mean responses of oxycodone HCl, the positive control (C), to the placebo (P):~H0: μC - μP ≤ δ1 versus Ha: μC - μP \> δ1 where δ1 =15p-value: <0.0001Mixed Models Analysis
Comparison: The primary analysis evaluated whether gabapentin plus oxycodone HCl (T) produced mean responses that showed abuse potential that was no higher than oxycodone HCl (C). The margin for showing no significant difference was defined as 20% of the difference between oxycodone HCl (C) and Placebo (P):~H0: μT - μC ≥ 0.2(μC - μP) versus Ha: μT - μC \<0.2(μC - μP).p-value: 0.1041Mixed Models Analysis
Comparison: The primary analysis evaluated whether gabapentin plus oxycodone HCl (T) produced mean responses that showed abuse potential that was no higher than oxycodone HCl (C). The margin for showing no significant difference was defined as 20% of the difference between oxycodone HCl (C) and Placebo (P):~H0: μT - μC ≥ 0.2(μC - μP) versus Ha: μT - μC \<0.2(μC - μP).p-value: 0.3373Mixed Models Analysis
Comparison: The null and alternative hypotheses for evaluating whether gabapentin (G) produced mean responses that show less abuse potential than oxycodone HCl (C) were:~H0: μC - μG ≤ 0.2(μC - 50) versus Ha: μC - μG \>0.2(μC - 50)p-value: <0.0001Mixed Models Analysis
Comparison: The null and alternative hypotheses for evaluating whether gabapentin (G) produced mean responses that show less abuse potential than oxycodone HCl (C) were:~H0: μC - μG ≤ 0.2(μC - 50) versus Ha: μC - μG \>0.2(μC - 50)p-value: <0.0001Mixed Models Analysis
Comparison: The null and alternative hypotheses for evaluating whether gabapentin (G) produced mean responses that show abuse potential similar to placebo(P) were:~H0: μG - μP ≥ δ2 versus Ha: μG - μP \< δ2 where δ2 =11p-value: 0.0232Mixed Models Analysis
Comparison: The null and alternative hypotheses for evaluating whether gabapentin (G) produced mean responses that show abuse potential similar to placebo(P) were:~H0: μG - μP ≥ δ2 versus Ha: μG - μP \< δ2 where δ2 =11.p-value: 0.2767Mixed Models Analysis
Secondary
Area Under the Effect Curve for High VAS (AUEClast)
Area under the effect-time profile from time 0 to the time of the last available data for the High visual analog scale which measures on a 100 mm visual analog scale the subject's response to the question I am feeling high where 0 = not at all and 100 =extremely
Time frame: Up to 48 hours after treatments (Assessments were made at the following timepoints after each treatment: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Modified completer population
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Area Under the Effect Curve for High VAS (AUEClast) | 33.45 units on a scale * hour | Standard Error 14.904 |
| Oxycodone HCl 20 mg Single Dose | Area Under the Effect Curve for High VAS (AUEClast) | 321.75 units on a scale * hour | Standard Error 46.346 |
| Gabapentin 600 mg Single Dose | Area Under the Effect Curve for High VAS (AUEClast) | 86.41 units on a scale * hour | Standard Error 31.541 |
| Gabapentin 1200 mg Single Dose | Area Under the Effect Curve for High VAS (AUEClast) | 123.74 units on a scale * hour | Standard Error 50.06 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Area Under the Effect Curve for High VAS (AUEClast) | 512.08 units on a scale * hour | Standard Error 66.299 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Area Under the Effect Curve for High VAS (AUEClast) | 425.01 units on a scale * hour | Standard Error 52.651 |
p-value: <0.000190% CI: [202.6, 370.8]Mixed Models Analysis
p-value: 0.291290% CI: [-30.2, 137.9]Mixed Models Analysis
p-value: 0.056390% CI: [13.62, 182]Mixed Models Analysis
p-value: <0.000190% CI: [400.1, 569]Mixed Models Analysis
p-value: <0.000190% CI: [312.4, 480.8]Mixed Models Analysis
p-value: <0.000190% CI: [-317, -149]Mixed Models Analysis
p-value: 0.000390% CI: [-273, -105]Mixed Models Analysis
p-value: 0.000190% CI: [113.7, 282]Mixed Models Analysis
p-value: 0.03290% CI: [25.8, 194]Mixed Models Analysis
Secondary
AUCinf of Gabapentin
Area under the plasma concentration/time curve from time 0 extrapolated to infinity time of gabapentin
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | AUCinf of Gabapentin | 41.42 micrograms*hour/milliliter | Standard Deviation 11.798 |
| Oxycodone HCl 20 mg Single Dose | AUCinf of Gabapentin | 65.38 micrograms*hour/milliliter | Standard Deviation 18.854 |
| Gabapentin 600 mg Single Dose | AUCinf of Gabapentin | 48.58 micrograms*hour/milliliter | Standard Deviation 12.009 |
| Gabapentin 1200 mg Single Dose | AUCinf of Gabapentin | 75.18 micrograms*hour/milliliter | Standard Deviation 18.431 |
Secondary
AUCinf of Oxycodone
Area under the plasma concentration/time curve from time 0 extrapolated to infinity time of Oxycodone
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | AUCinf of Oxycodone | 233.29 nanograms*hour/milliliter | Standard Deviation 64.369 |
| Oxycodone HCl 20 mg Single Dose | AUCinf of Oxycodone | 228.40 nanograms*hour/milliliter | Standard Deviation 71.854 |
| Gabapentin 600 mg Single Dose | AUCinf of Oxycodone | 234.94 nanograms*hour/milliliter | Standard Deviation 77.115 |
Secondary
AUClast of Gabapentin
Area under the plasma concentration/time profile from time 0 to the time of the last quantifiable concentration of gabapentin
Time frame: Up to 48 hours after treatment (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interes
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | AUClast of Gabapentin | 39.76 micrograms*hour/milliliter | Standard Deviation 11.856 |
| Oxycodone HCl 20 mg Single Dose | AUClast of Gabapentin | 61.42 micrograms*hour/milliliter | Standard Deviation 19.9 |
| Gabapentin 600 mg Single Dose | AUClast of Gabapentin | 47.31 micrograms*hour/milliliter | Standard Deviation 12.142 |
| Gabapentin 1200 mg Single Dose | AUClast of Gabapentin | 72.73 micrograms*hour/milliliter | Standard Deviation 17.781 |
Secondary
AUClast of Oxycodone
Area under the plasma concentration/time profile from time 0 to the time of the last quantifiable concentration of Oxycodone
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | AUClast of Oxycodone | 229.31 nanograms*hour/milliliter | Standard Deviation 64.935 |
| Oxycodone HCl 20 mg Single Dose | AUClast of Oxycodone | 224.79 nanograms*hour/milliliter | Standard Deviation 71.748 |
| Gabapentin 600 mg Single Dose | AUClast of Oxycodone | 234.65 nanograms*hour/milliliter | Standard Deviation 80.068 |
Secondary
Bipolar VAS for Drug Liking: Area Under the Effect Curve From Time 0 to the Last Available Data (AUEClast)
Area under the effect-time profile from time 0 to the time of the last available data for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking
Time frame: Up to 48 hours after treatments (Assessments were made at the following timepoints after each treatment: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Modified completer population
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar VAS for Drug Liking: Area Under the Effect Curve From Time 0 to the Last Available Data (AUEClast) | 2394.21 units on a scale * hour | Standard Error 65.274 |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve From Time 0 to the Last Available Data (AUEClast) | 2661.43 units on a scale * hour | Standard Error 84.274 |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve From Time 0 to the Last Available Data (AUEClast) | 2422.37 units on a scale * hour | Standard Error 85.855 |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve From Time 0 to the Last Available Data (AUEClast) | 2444.4 units on a scale * hour | Standard Error 83.58 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve From Time 0 to the Last Available Data (AUEClast) | 2744.86 units on a scale * hour | Standard Error 76.342 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve From Time 0 to the Last Available Data (AUEClast) | 2759.57 units on a scale * hour | Standard Error 74.589 |
p-value: 0.001690% CI: [128.8, 405.4]Mixed Models Analysis
p-value: 0.727690% CI: [-109, 167.5]Mixed Models Analysis
p-value: 0.548190% CI: [-88, 188.9]Mixed Models Analysis
p-value: <0.000190% CI: [211.8, 489.5]Mixed Models Analysis
p-value: <0.000190% CI: [225.9, 502.8]Mixed Models Analysis
p-value: 0.00590% CI: [-376, -99.4]Mixed Models Analysis
p-value: 0.010690% CI: [-356, -77.8]Mixed Models Analysis
p-value: 0.319690% CI: [-54.9, 222.1]Mixed Models Analysis
p-value: 0.246490% CI: [-41, 235.6]Mixed Models Analysis
Secondary
Bipolar VAS for Drug Liking: Area Under the Effect Curve to 1 Hour (AUEC1)
Area under the effect-time profile from time 0 to 1 hour post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking
Time frame: Up to 1 hour post-dose (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, and 1 hour)
Population: Modified completer population
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 1 Hour (AUEC1) | 50.17 units on a scale * hour | Standard Error 0.317 |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 1 Hour (AUEC1) | 58.86 units on a scale * hour | Standard Error 1.478 |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 1 Hour (AUEC1) | 51.28 units on a scale * hour | Standard Error 1.44 |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 1 Hour (AUEC1) | 50.61 units on a scale * hour | Standard Error 0.568 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 1 Hour (AUEC1) | 57.02 units on a scale * hour | Standard Error 1.771 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 1 Hour (AUEC1) | 55.76 units on a scale * hour | Standard Error 1.39 |
Secondary
Bipolar VAS for Drug Liking: Area Under the Effect Curve to 2 Hours (AUEC2)
Area under the effect-time profile from time 0 to 2 hours post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking
Time frame: Up to 2 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, and 2 hours)
Population: Modified completer population
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 2 Hours (AUEC2) | 102.62 units on a scale * hour | Standard Error 1.791 |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 2 Hours (AUEC2) | 140.44 units on a scale * hour | Standard Error 4.434 |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 2 Hours (AUEC2) | 105.20 units on a scale * hour | Standard Error 4.017 |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 2 Hours (AUEC2) | 107.19 units on a scale * hour | Standard Error 2.449 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 2 Hours (AUEC2) | 138.72 units on a scale * hour | Standard Error 4.34 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 2 Hours (AUEC2) | 133.84 units on a scale * hour | Standard Error 4.01 |
Secondary
Bipolar VAS for Drug Liking: Area Under the Effect Curve to 3 Hours (AUEC3)
Area under the effect-time profile from time 0 to 3 hours post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking
Time frame: up to 3 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, and 3 hours)
Population: Modified completer population
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 3 Hours (AUEC3) | 155.48 units on a scale * hour | Standard Error 3.651 |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 3 Hours (AUEC3) | 219.31 units on a scale * hour | Standard Error 7.614 |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 3 Hours (AUEC3) | 161.07 units on a scale * hour | Standard Error 6.535 |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 3 Hours (AUEC3) | 164.03 units on a scale * hour | Standard Error 4.819 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 3 Hours (AUEC3) | 223.22 units on a scale * hour | Standard Error 7.326 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 3 Hours (AUEC3) | 214.99 units on a scale * hour | Standard Error 6.567 |
Secondary
Bipolar VAS for Drug Liking: Area Under the Effect Curve to 4 Hours (AUEC4)
Area under the effect-time profile from time 0 to 4 hours post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking
Time frame: Up to 4 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, and 4 hours)
Population: Modified completer population
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 4 Hours (AUEC4) | 208.32 units on a scale * hour | Standard Error 5.171 |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 4 Hours (AUEC4) | 294.28 units on a scale * hour | Standard Error 10.329 |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 4 Hours (AUEC4) | 214.53 units on a scale * hour | Standard Error 8.878 |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 4 Hours (AUEC4) | 220.08 units on a scale * hour | Standard Error 6.896 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 4 Hours (AUEC4) | 305.08 units on a scale * hour | Standard Error 10.423 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 4 Hours (AUEC4) | 293.99 units on a scale * hour | Standard Error 8.81 |
Secondary
Bipolar VAS for Drug Liking: Area Under the Effect Curve to 8 Hours (AUEC8)
Area under the effect-time profile from time 0 to 8 hours post-dose for the Drug liking visual analog scale which assesses how much a participant likes or dislikes a drug effect at the time the question (at this moment, my liking this drug is) is being asked. It is scored using a 100 mm visual analogue scale (VAS), where 0 mm = Strong Disliking, 50 mm = Neither Like nor Dislike, and 100 mm = Strong Liking
Time frame: Up to 8 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, and 8 hours)
Population: Modified completer population
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 8 Hours (AUEC8) | 411.58 units on a scale * hour | Standard Error 12.224 |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 8 Hours (AUEC8) | 551.53 units on a scale * hour | Standard Error 19.517 |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 8 Hours (AUEC8) | 421.12 units on a scale * hour | Standard Error 17.144 |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 8 Hours (AUEC8) | 438.30 units on a scale * hour | Standard Error 13.862 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 8 Hours (AUEC8) | 599.96 units on a scale * hour | Standard Error 22.312 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking: Area Under the Effect Curve to 8 Hours (AUEC8) | 574.98 units on a scale * hour | Standard Error 18.952 |
Secondary
Bipolar VAS for Drug Liking - Time to Maximum Effect (TEmax)
Time after dosing when the maximum effect for Drug Liking VAS is reached
Time frame: up to 48 hours after treatments
Population: Modified completer population
| Arm | Measure | Value (MEDIAN) |
|---|---|---|
| Placebo | Bipolar VAS for Drug Liking - Time to Maximum Effect (TEmax) | 0.25 hours |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Drug Liking - Time to Maximum Effect (TEmax) | 1.00 hours |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Drug Liking - Time to Maximum Effect (TEmax) | 0.25 hours |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Drug Liking - Time to Maximum Effect (TEmax) | 0.28 hours |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking - Time to Maximum Effect (TEmax) | 1.00 hours |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Drug Liking - Time to Maximum Effect (TEmax) | 1.50 hours |
Secondary
Bipolar VAS for Overall Drug Liking
100 mm visual analog scale at 24, 36, and 48 hours post-dose for the question Overall, my liking for this drug is where 0 = definitely not, 50 = neutral, and 100 = definitely so. The data from the 24, 36, and 48 hours postdose measurements were combined into a single overall model-adjusted value for 24 to 48 hours post-treatment timeframe by estimation from a mixed model with treatment, period, treatment sequence, time, and treatment\*time as fixed effects, subject nested within sequence as a random effect. The compound symmetric covariance matrix was employed. Data from all time points were included
Time frame: Up to 48 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 24, 36, and 48 hours)
Population: Modified completer population
| Arm | Measure | Value (LEAST_SQUARES_MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar VAS for Overall Drug Liking | 51.75 Score on a 100 mm scale | Standard Error 2.895 |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Overall Drug Liking | 72.06 Score on a 100 mm scale | Standard Error 2.886 |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Overall Drug Liking | 54.40 Score on a 100 mm scale | Standard Error 2.909 |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Overall Drug Liking | 58.25 Score on a 100 mm scale | Standard Error 2.902 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Overall Drug Liking | 75.90 Score on a 100 mm scale | Standard Error 2.907 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Overall Drug Liking | 79.94 Score on a 100 mm scale | Standard Error 2.878 |
p-value: <0.000190% CI: [16.61, 24.01]Mixed Models Analysis
p-value: 0.243990% CI: [-1.09, 6.39]Mixed Models Analysis
p-value: 0.004490% CI: [2.75, 10.25]Mixed Models Analysis
p-value: <0.000190% CI: [20.39, 27.91]Mixed Models Analysis
p-value: <0.000190% CI: [24.5, 31.88]Mixed Models Analysis
p-value: <0.000190% CI: [-21.4, -13.9]Mixed Models Analysis
p-value: <0.000190% CI: [-17.5, -10.1]Mixed Models Analysis
p-value: 0.090790% CI: [0.11, 7.57]Mixed Models Analysis
p-value: 0.000490% CI: [4.22, 11.55]Mixed Models Analysis
Secondary
Bipolar VAS for Take Drug Again
100 mm visual analog scale at 24, 36, and 48 hours post-dose for the question I would take this drug again where 0 = definitely not, 50 = neutral, and 100 = definitely so. The data from the 24, 36, and 48 hours postdose measurements were combined into a single overall model-adjusted value for 24 to 48 hours post-treatment timeframe by estimation from a mixed model with treatment, period, treatment sequence, time, and treatment\*time as fixed effects, subject nested within sequence as a random effect. The compound symmetric covariance matrix was employed. Data from all time points were included
Time frame: Up to 48 hours after treatments (Assessments were made at the following timepoints after each treatment for this outcome measure: 24, 36, and 48 hours)
Population: Modified completer population
| Arm | Measure | Value (LEAST_SQUARES_MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Bipolar VAS for Take Drug Again | 53.43 Score on a 100 mm scale | Standard Error 2.928 |
| Oxycodone HCl 20 mg Single Dose | Bipolar VAS for Take Drug Again | 72.16 Score on a 100 mm scale | Standard Error 2.918 |
| Gabapentin 600 mg Single Dose | Bipolar VAS for Take Drug Again | 55.19 Score on a 100 mm scale | Standard Error 2.942 |
| Gabapentin 1200 mg Single Dose | Bipolar VAS for Take Drug Again | 58.05 Score on a 100 mm scale | Standard Error 2.935 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Bipolar VAS for Take Drug Again | 79.16 Score on a 100 mm scale | Standard Error 2.94 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Bipolar VAS for Take Drug Again | 77.85 Score on a 100 mm scale | Standard Error 2.91 |
p-value: <0.000190% CI: [14.98, 22.48]Mixed Models Analysis
p-value: 0.505690% CI: [-2.03, 5.56]Mixed Models Analysis
p-value: 0.07690% CI: [0.82, 8.42]Mixed Models Analysis
p-value: <0.000190% CI: [21.92, 29.54]Mixed Models Analysis
p-value: <0.000190% CI: [20.68, 28.16]Mixed Models Analysis
p-value: <0.000190% CI: [-20.8, -13.2]Mixed Models Analysis
p-value: <0.000190% CI: [-17.9, -10.3]Mixed Models Analysis
p-value: 0.002490% CI: [3.22, 10.79]Mixed Models Analysis
p-value: 0.011890% CI: [1.98, 9.41]Mixed Models Analysis
Secondary
Cmax of Gabapentin
Maximum plasma concentration of gabapentin
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest.
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Cmax of Gabapentin | 4.16 micrograms/milliliter | Standard Deviation 1.422 |
| Oxycodone HCl 20 mg Single Dose | Cmax of Gabapentin | 6.07 micrograms/milliliter | Standard Deviation 1.951 |
| Gabapentin 600 mg Single Dose | Cmax of Gabapentin | 4.17 micrograms/milliliter | Standard Deviation 1.121 |
| Gabapentin 1200 mg Single Dose | Cmax of Gabapentin | 6.18 micrograms/milliliter | Standard Deviation 1.443 |
Secondary
Cmax of Oxycodone
Maximum plasma concentration of Oxycodone
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Cmax of Oxycodone | 44.92 nanograms/milliliter | Standard Deviation 17.336 |
| Oxycodone HCl 20 mg Single Dose | Cmax of Oxycodone | 43.82 nanograms/milliliter | Standard Deviation 14.144 |
| Gabapentin 600 mg Single Dose | Cmax of Oxycodone | 40.79 nanograms/milliliter | Standard Deviation 14.809 |
Secondary
Half-life (t½) of Gabapentin
Half-life (t½) of gabapentin
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Half-life (t½) of Gabapentin | 9.14 Hours | Standard Deviation 10.846 |
| Oxycodone HCl 20 mg Single Dose | Half-life (t½) of Gabapentin | 10.62 Hours | Standard Deviation 7.674 |
| Gabapentin 600 mg Single Dose | Half-life (t½) of Gabapentin | 8.20 Hours | Standard Deviation 3.551 |
| Gabapentin 1200 mg Single Dose | Half-life (t½) of Gabapentin | 9.19 Hours | Standard Deviation 3.596 |
Secondary
Half-life (t½) of Oxycodone
Half-life (t½) of Oxycodone
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest
| Arm | Measure | Value (MEDIAN) |
|---|---|---|
| Placebo | Half-life (t½) of Oxycodone | 4.12 hours |
| Oxycodone HCl 20 mg Single Dose | Half-life (t½) of Oxycodone | 3.84 hours |
| Gabapentin 600 mg Single Dose | Half-life (t½) of Oxycodone | 3.90 hours |
Secondary
Tmax of Gabapentin
Time when the maximum concentration of gabapentin is reached
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest
| Arm | Measure | Value (MEDIAN) |
|---|---|---|
| Placebo | Tmax of Gabapentin | 3.13 Hours |
| Oxycodone HCl 20 mg Single Dose | Tmax of Gabapentin | 3.13 Hours |
| Gabapentin 600 mg Single Dose | Tmax of Gabapentin | 3.13 Hours |
| Gabapentin 1200 mg Single Dose | Tmax of Gabapentin | 3.13 Hours |
Secondary
Tmax of Oxycodone
Time when the maximum concentration of Oxycodone is reached
Time frame: Up to 48 hours after treatments (concentrations were measured at the following timepoints after each treatment for this outcome measure: 0, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 6, 8, 12, 24, 36, and 48 hours)
Population: Pharmacokinetic population: all enrolled participants who received study medication and have pharmacokinetic data for the parameters of interest
| Arm | Measure | Value (MEDIAN) |
|---|---|---|
| Placebo | Tmax of Oxycodone | 1.15 hours |
| Oxycodone HCl 20 mg Single Dose | Tmax of Oxycodone | 1.15 hours |
| Gabapentin 600 mg Single Dose | Tmax of Oxycodone | 1.63 hours |
Secondary
Unipolar VAS for Any Drug Effect
100 mm visual analog scale for the question At this moment, I can feel any drug effects where 0 = not at all and 100 = extremely
Time frame: up to 48 hours after treatments
Population: Modified completer population
| Arm | Measure | Value (LEAST_SQUARES_MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Unipolar VAS for Any Drug Effect | 3.77 Score on a 100 mm scale | Standard Error 2.167 |
| Oxycodone HCl 20 mg Single Dose | Unipolar VAS for Any Drug Effect | 28.46 Score on a 100 mm scale | Standard Error 2.161 |
| Gabapentin 600 mg Single Dose | Unipolar VAS for Any Drug Effect | 6.63 Score on a 100 mm scale | Standard Error 2.162 |
| Gabapentin 1200 mg Single Dose | Unipolar VAS for Any Drug Effect | 7.88 Score on a 100 mm scale | Standard Error 2.164 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Unipolar VAS for Any Drug Effect | 34.34 Score on a 100 mm scale | Standard Error 2.163 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Unipolar VAS for Any Drug Effect | 33.76 Score on a 100 mm scale | Standard Error 2.158 |
p-value: <0.000190% CI: [22.19, 27.21]Mixed Models Analysis
p-value: 0.060690% CI: [0.35, 5.38]Mixed Models Analysis
p-value: 0.007490% CI: [1.59, 6.64]Mixed Models Analysis
p-value: <0.000190% CI: [28.05, 33.1]Mixed Models Analysis
p-value: <0.000190% CI: [27.48, 32.5]Mixed Models Analysis
p-value: <0.000190% CI: [-24.3, -19.3]Mixed Models Analysis
p-value: <0.000190% CI: [-23.1, -18.1]Mixed Models Analysis
p-value: 0.000190% CI: [3.37, 8.38]Mixed Models Analysis
p-value: 0.000590% CI: [2.8, 7.78]Mixed Models Analysis
Secondary
Unipolar VAS for Bad Drug Effect
100 mm visual analog scale for the question At this moment, I can feel bad drug effects where 0 = not at all and 100 = extremely
Time frame: up to 48 hours after treatments
Population: Modified completer population
| Arm | Measure | Value (LEAST_SQUARES_MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Unipolar VAS for Bad Drug Effect | 0.19 Score on a 100 mm scale | Standard Error 1.211 |
| Oxycodone HCl 20 mg Single Dose | Unipolar VAS for Bad Drug Effect | 4.41 Score on a 100 mm scale | Standard Error 1.209 |
| Gabapentin 600 mg Single Dose | Unipolar VAS for Bad Drug Effect | 0.82 Score on a 100 mm scale | Standard Error 1.209 |
| Gabapentin 1200 mg Single Dose | Unipolar VAS for Bad Drug Effect | 0.97 Score on a 100 mm scale | Standard Error 1.21 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Unipolar VAS for Bad Drug Effect | 4.10 Score on a 100 mm scale | Standard Error 1.21 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Unipolar VAS for Bad Drug Effect | 3.41 Score on a 100 mm scale | Standard Error 1.207 |
p-value: 0.291690% CI: [-0.44, 2.02]Mixed Models Analysis
p-value: <0.000190% CI: [3.01, 5.45]Mixed Models Analysis
p-value: 0.393390% CI: [-0.59, 1.86]Mixed Models Analysis
p-value: <0.000190% CI: [2.69, 5.15]Mixed Models Analysis
p-value: <0.000190% CI: [2, 4.44]Mixed Models Analysis
p-value: <0.000190% CI: [-4.81, -2.38]Mixed Models Analysis
p-value: <0.000190% CI: [-4.66, -2.22]Mixed Models Analysis
p-value: 0.676590% CI: [-1.53, 0.91]Mixed Models Analysis
p-value: 0.171290% CI: [-2.22, 0.2]Mixed Models Analysis
Secondary
Unipolar VAS for Good Drug Effect
100 mm visual analog scale for the question At this moment, I can feel good drug effects where 0 = not at all and 100 = extremely
Time frame: up to 48 hours after treatments
Population: Modified completer population
| Arm | Measure | Value (LEAST_SQUARES_MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Unipolar VAS for Good Drug Effect | 2.54 Score on a 100 mm scale | Standard Error 2.123 |
| Oxycodone HCl 20 mg Single Dose | Unipolar VAS for Good Drug Effect | 27.91 Score on a 100 mm scale | Standard Error 2.117 |
| Gabapentin 600 mg Single Dose | Unipolar VAS for Good Drug Effect | 6.13 Score on a 100 mm scale | Standard Error 2.117 |
| Gabapentin 1200 mg Single Dose | Unipolar VAS for Good Drug Effect | 8.73 Score on a 100 mm scale | Standard Error 2.12 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Unipolar VAS for Good Drug Effect | 34.72 Score on a 100 mm scale | Standard Error 2.119 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Unipolar VAS for Good Drug Effect | 32.71 Score on a 100 mm scale | Standard Error 2.113 |
p-value: <0.000190% CI: [4.3, 9.31]Mixed Models Analysis
p-value: 0.001590% CI: [2.31, 7.29]Mixed Models Analysis
p-value: <0.000190% CI: [22.86, 27.88]Mixed Models Analysis
p-value: 0.018990% CI: [1.08, 6.11]Mixed Models Analysis
p-value: <0.000190% CI: [3.66, 8.71]Mixed Models Analysis
p-value: <0.000190% CI: [29.65, 34.71]Mixed Models Analysis
p-value: <0.000190% CI: [27.66, 32.68]Mixed Models Analysis
p-value: <0.000190% CI: [-24.3, -19.3]Mixed Models Analysis
p-value: <0.000190% CI: [-21.7, -16.7]Mixed Models Analysis
Secondary
Unipolar VAS for High - Maximum Effect (Emax)
Maximum effect on the 100 mm visual analog scale for the question I am feeling high where 0 = not at all and 100 = extremely
Time frame: up to 48 hours after treatments
Population: Modified completer population
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Placebo | Unipolar VAS for High - Maximum Effect (Emax) | 13.45 Score on a 100 mm scale | Standard Error 4.854 |
| Oxycodone HCl 20 mg Single Dose | Unipolar VAS for High - Maximum Effect (Emax) | 77.36 Score on a 100 mm scale | Standard Error 5.816 |
| Gabapentin 600 mg Single Dose | Unipolar VAS for High - Maximum Effect (Emax) | 28.61 Score on a 100 mm scale | Standard Error 6.551 |
| Gabapentin 1200 mg Single Dose | Unipolar VAS for High - Maximum Effect (Emax) | 25.21 Score on a 100 mm scale | Standard Error 6.412 |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Unipolar VAS for High - Maximum Effect (Emax) | 81.86 Score on a 100 mm scale | Standard Error 5.62 |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Unipolar VAS for High - Maximum Effect (Emax) | 88.74 Score on a 100 mm scale | Standard Error 4.21 |
p-value: <0.000190% CI: [52.15, 77.2]Mixed Models Analysis
p-value: 0.054690% CI: [2.13, 27.1]Mixed Models Analysis
p-value: 0.128690% CI: [-0.96, 24.12]Mixed Models Analysis
p-value: <0.000190% CI: [56.42, 81.57]Mixed Models Analysis
p-value: <0.000190% CI: [63.83, 88.91]Mixed Models Analysis
p-value: <0.000190% CI: [-62.6, -37.5]Mixed Models Analysis
p-value: <0.000190% CI: [-65.7, -40.5]Mixed Models Analysis
p-value: 0.569990% CI: [-8.22, 16.86]Mixed Models Analysis
p-value: 0.124390% CI: [-0.83, 24.23]Mixed Models Analysis
Secondary
Unipolar VAS for High: Time to Maximum Effect (TEmax)
Time after dosing when the maximum effect for High VAS is reached
Time frame: up to 48 hours after treatments
Population: Modified completer population
| Arm | Measure | Value (MEDIAN) |
|---|---|---|
| Placebo | Unipolar VAS for High: Time to Maximum Effect (TEmax) | 0.25 hours |
| Oxycodone HCl 20 mg Single Dose | Unipolar VAS for High: Time to Maximum Effect (TEmax) | 1.00 hours |
| Gabapentin 600 mg Single Dose | Unipolar VAS for High: Time to Maximum Effect (TEmax) | 0.26 hours |
| Gabapentin 1200 mg Single Dose | Unipolar VAS for High: Time to Maximum Effect (TEmax) | 0.27 hours |
| Gabapentin 600 mg and Oxycodone HCl 20 mg | Unipolar VAS for High: Time to Maximum Effect (TEmax) | 1.00 hours |
| Gabapentin 1200 mg and Oxycodone HCl 20 mg | Unipolar VAS for High: Time to Maximum Effect (TEmax) | 1.50 hours |