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Metformin Extended Release Versus Metformin Immediate Release in Subjects With Type 2 Diabetes

CONSENT - Comparison of metfOrmin XR to IR as moNotherapy in the Newly diagnoSed Type 2 diabEtes Patients for the gastroiNtestinal Tolerability and Efficacy: a Randomized, Parallel Control, Open-label and Multicenter Study

Status
Completed
Phases
Phase 4
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT02252965
Acronym
CONSENT
Enrollment
532
Registered
2014-09-30
Start date
2014-12-31
Completion date
2016-04-30
Last updated
2017-01-24

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Diabetes Mellitus, Type 2

Keywords

Diabetes Mellitus, Type 2, Metformin XR, Metformin IR

Brief summary

This is a Phase 4, prospective, open label, randomized, parallel controlled multicenter trial in which metformin extended release (XR) will be compared with metformin immediate release (IR) for the gastrointestinal tolerability and efficacy in the newly diagnosed subjects with Type 2 diabetes who have glycosylated hemoglobin (HbA1c) value between 7.0 to 10.0 percent (%).

Interventions

Subjects will receive Metformin Immediate Release (IR) tablets, orally once daily at a dose of 500 milligram (mg) for 1 week, and then dose will increase with increments of 500 mg every week in first 2 weeks to 1500 mg. After that dose will increase up to maximum dose of 2000 mg for the next 2 weeks and will be maintained at 2000 mg until Week 16.

DRUGMetformin XR

Subjects will receive Metformin Extended Release (XR) tablets, orally once daily at a dose of 500 mg for 1 week, and then dose will increase with increments of 500 mg every week in first 2 weeks to 1500 mg. After that dose will increase up to maximum dose of 2000 mg for the next 2 weeks and will be maintained at 2000 mg until Week 16.

Sponsors

Merck KGaA, Darmstadt, Germany
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to 79 Years
Healthy volunteers
No

Inclusion criteria

* Diagnosis of Type 2 diabetes mellitus before the screening visit based on the World Health Organization (WHO) diagnostic and classification criteria * HbA1c value of 7.0-10.0%, inclusive * Age ranging from 18 to 79 years, inclusive * Treatment-naive for oral antidiabetic agents (that is, had not received antidiabetic medication previously, or had received antidiabetic medication for at least 14 days and not within 1 month of enrolment) * Male, or non-pregnant, non-breastfeeding females * Body mass index (BMI) greater than or equal to (\>=) 18.5 and less than (\<) 35 kilogram per square meter (kg/m\^2) * In the opinion of the investigator, subjects are well-motivated, capable and willing to continue the study treatment as required during the whole study period, maintain a study dietary, as required for this protocol, attend scheduled visits and be willing to receive phone calls between visits, avoid pregnancy by using an adequate method of contraception throughout the duration of the study for the female subjects of child bearing potential (and if appropriate male subjects with female partners of childbearing potential) * Written informed consent given before any trial-related activities are carried out

Exclusion criteria

* Type 1 diabetes * Previous treatment with insulin or other antidiabetics (including Chinese traditional medicine) for more than 14 days continuously or within 1 month of enrolment * Any of the protocol-specified cardiovascular conditions within 3 months prior to the screening visit * Impaired liver function as defined in the protocol * Serum creatinine values as specified in the protocol * Known proliferative retinopathy or maculopathy requiring acute treatment, or recurrent major hypoglycemia or hypoglycemic unawareness as judged by the investigator * Persistent uncontrolled hypertension * Severe chronic gastrointestinal disease * Previous history of 1 or more episodes of ketoacidosis or hyperosmolar state/coma * Currently receiving chronic (\>14 days) systemic glucocorticoid therapy (excluding topical, intraocular, inhaled or intranasal preparations) or have received such therapy within 4 weeks of the screening visit * Current use of beta-blockers, thiazide diuretic, thyroid products, estrogens, oral contraceptives, phenytoin, nicotinic acid, sympathomimetics, nifedipine and isoniazid and cannot be replaced by any other treatment * Have any hematologic condition that may interfere with HbA1c measurement (for example, hemolytic anemia, sickle-cell disease) * Have any other condition (such as, known drug or alcohol abuse or a psychiatric disorder) that may prevent the subject from following and completing the protocol * Known hypersensitivity to Metformin Hydrochloride * Currently enrolled in, or discontinued within the last 30 days from, a clinical trial involving an investigational product or non-approved use of a drug or device, or concurrently enrolled in any other type of medical research judged not to be scientifically or medically compatible with this study * Any contraindications to Metformin according to local package insert

Design outcomes

Primary

MeasureTime frameDescription
Change From Baseline in Glycosylated Hemoglobin (HbA1c) at Week 16Baseline, Week 16
Overall Gastrointestinal (GI) Tolerability Assessed as Percentage of Subjects With Gastrointestinal Adverse Events During Treatment PeriodBaseline up to Week 16An adverse event (AE) was defined as any untoward medical occurrence in a subject which does not necessarily have a causal relationship with the treatment. An AE was any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with use of a medicinal product, whether or not considered related to the medicinal product.

Secondary

MeasureTime frameDescription
Change From Baseline in 2-Hour Postprandial Plasma Glucose (PPG) Level at Weeks 8 and 16Baseline, Week 8 and 16The 2-hour Postprandial plasma glucose (PPG) level refers to the plasma glucose concentrations after 2 hours of eating.
Percentage of Subjects With HypoglycemiaBaseline up to Week 16Hypoglycemia, also called as low blood glucose or low blood sugar, is defined as the blood glucose level of less than normal (that is less than 3.9 millimole per liter \[mmol/L\]).
Percentage of Subjects With Marked HyperglycemiaBaseline up to Week 16Marked hyperglycemia was defined as the FPG level of greater than or equal to 11.1 mmol/L.
Percentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodBaseline up to Week 16An adverse event (AE) was defined as any untoward medical occurrence in a subject which does not necessarily have a causal relationship with the treatment. An AE was any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with use of a medicinal product, whether or not considered related to the medicinal product. Number of subjects with pre-specified gastrointestinal adverse events (diarrhea, nausea, abdominal pain, bloating, constipation, dyspepsia and flatulence) were reported.
Percentage of Subjects Who Are Totally Intolerant to the TreatmentBaseline up to Week 16Subjects were considered to be totally intolerant if they experienced a Grade 3 or higher toxicity considered at least possibly related to the treatment.
Percentage of Subjects With HbA1c Less Than (<) 7% and With no Severe Gastrointestinal (GI) and Other Adverse Events (AEs)Baseline up to Week 16Percentage of subjects with HbA1c \<7% and with no severe GI and other AEs were reported. Severe adverse events were based on Common Terminology Criteria for Adverse Events (CTCAE), version 4.0 and were defined as those events which were medically significant but not immediately life-threatening; hospitalization or prolongation of hospitalization indicated; disabling; limiting self-care activities of daily living (ADL). Self-care ADL refer to bathing, dressing and undressing, feeding self, using the toilet, taking medications, and not bedridden.
Percentage of Subjects Who Are Compliant to TreatmentBaseline up to Week 16Compliance was defined as not skipping or forgetting dosing or not delaying the dosing time. Subjects who never missed a dose of medication were considered compliant.
Percentage of Subjects With HbA1c Less Than (<) 7%Baseline up to Week 16
Change From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Baseline, Week 1, 2, 4, 8, 12,16

Countries

Germany

Participant flow

Participants by arm

ArmCount
Metformin IR
Subjects received Metformin IR tablets, orally QD at a dose of 500 milligram (mg) for 1 week, and then the dose was increased with increments of 500 mg every week in the first 2 weeks to 1500 mg. After that, the dose was increased up to a maximum dose of 2000 mg for the next two weeks and maintained at 2000 mg until Week 16.
267
Metformin XR
Subjects received Metformin XR tablets, orally QD at a dose of 500 mg for 1 week, and then the dose was increased with increments of 500 mg every week in the first 2 weeks to 1500 mg. After that, the dose was increased up to a maximum dose of 2000 mg for next 2 weeks and maintained at 2000 mg until Week 16.
265
Total532

Withdrawals & dropouts

PeriodReasonFG000FG001
Overall StudyAdverse Event914
Overall StudyLack of Efficacy02
Overall StudyLost to Follow-up168
Overall StudyOther45
Overall StudyProtocol Violation45
Overall StudyWithdrawal by Subject79

Baseline characteristics

CharacteristicMetformin IRMetformin XRTotal
Age, Continuous54.4 years
STANDARD_DEVIATION 10.21
53.1 years
STANDARD_DEVIATION 9.72
53.8 years
STANDARD_DEVIATION 9.98
Gender
Female
112 Participants108 Participants220 Participants
Gender
Male
155 Participants157 Participants312 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
deaths
Total, all-cause mortality
— / —— / —— / —
other
Total, other adverse events
96 / 249136 / 26412 / 12
serious
Total, serious adverse events
6 / 2492 / 2640 / 12

Outcome results

Primary

Change From Baseline in Glycosylated Hemoglobin (HbA1c) at Week 16

Time frame: Baseline, Week 16

Population: Per-protocol (PP) population included all subjects who were randomly allocated to a treatment based on intent to treat and were compliant with protocol (absence of any major protocol violations). Here Number of Participants Analyzed signifies those subjects who were evaluable for this outcome measure.

ArmMeasureValue (LEAST_SQUARES_MEAN)Dispersion
Metformin IRChange From Baseline in Glycosylated Hemoglobin (HbA1c) at Week 16-1.61 Percentage of HbA1cStandard Error 0.05
Metformin XRChange From Baseline in Glycosylated Hemoglobin (HbA1c) at Week 16-1.58 Percentage of HbA1cStandard Error 0.05
95% CI: [-0.1, 0.17]
Primary

Overall Gastrointestinal (GI) Tolerability Assessed as Percentage of Subjects With Gastrointestinal Adverse Events During Treatment Period

An adverse event (AE) was defined as any untoward medical occurrence in a subject which does not necessarily have a causal relationship with the treatment. An AE was any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with use of a medicinal product, whether or not considered related to the medicinal product.

Time frame: Baseline up to Week 16

Population: The safety population included all subjects who received at least 1 dose of trial treatment.

ArmMeasureValue (NUMBER)
Metformin IROverall Gastrointestinal (GI) Tolerability Assessed as Percentage of Subjects With Gastrointestinal Adverse Events During Treatment Period23.8 percentage of subjects
Metformin XROverall Gastrointestinal (GI) Tolerability Assessed as Percentage of Subjects With Gastrointestinal Adverse Events During Treatment Period22.3 percentage of subjects
p-value: 0.67495% CI: [-8.6, 5.56]Mantel Haenszel
Secondary

Change From Baseline in 2-Hour Postprandial Plasma Glucose (PPG) Level at Weeks 8 and 16

The 2-hour Postprandial plasma glucose (PPG) level refers to the plasma glucose concentrations after 2 hours of eating.

Time frame: Baseline, Week 8 and 16

Population: ITT population included all subjects who were randomly allocated to a treatment based on the intention to treat. Here Number of Participants Analyzed signifies those subjects who were evaluable for this outcome measure. Here n signifies those subjects who were evaluable for the specified time points for each arm, respectively.

ArmMeasureGroupValue (MEAN)Dispersion
Metformin IRChange From Baseline in 2-Hour Postprandial Plasma Glucose (PPG) Level at Weeks 8 and 16Baseline (n= 223, 231)14.604 mmol/LStandard Deviation 3.4334
Metformin IRChange From Baseline in 2-Hour Postprandial Plasma Glucose (PPG) Level at Weeks 8 and 16Change at Week 8 (n= 215, 229)-3.608 mmol/LStandard Deviation 3.6964
Metformin IRChange From Baseline in 2-Hour Postprandial Plasma Glucose (PPG) Level at Weeks 8 and 16Change at Week 16 (n= 213, 215)-3.642 mmol/LStandard Deviation 3.7261
Metformin XRChange From Baseline in 2-Hour Postprandial Plasma Glucose (PPG) Level at Weeks 8 and 16Baseline (n= 223, 231)14.764 mmol/LStandard Deviation 3.7705
Metformin XRChange From Baseline in 2-Hour Postprandial Plasma Glucose (PPG) Level at Weeks 8 and 16Change at Week 8 (n= 215, 229)-3.264 mmol/LStandard Deviation 5.9134
Metformin XRChange From Baseline in 2-Hour Postprandial Plasma Glucose (PPG) Level at Weeks 8 and 16Change at Week 16 (n= 213, 215)-3.693 mmol/LStandard Deviation 3.5414
Secondary

Change From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16

Time frame: Baseline, Week 1, 2, 4, 8, 12,16

Population: ITT population included all subjects who were randomly allocated to a treatment based on the intention to treat. Here Number of Participants Analyzed signifies those subjects who were evaluable for this outcome measure. Here n signifies those subjects who were evaluable for the specified time points for each arm, respectively.

ArmMeasureGroupValue (MEAN)Dispersion
Metformin IRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 2 (n= 243, 244)-1.324 Millimole Per Liter (mmol/L)Standard Deviation 1.4426
Metformin IRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 8 (n= 219, 230)-2.075 Millimole Per Liter (mmol/L)Standard Deviation 1.7359
Metformin IRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 1 (n= 249, 248)-0.647 Millimole Per Liter (mmol/L)Standard Deviation 1.5615
Metformin IRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 12 (n= 216, 221)-2.053 Millimole Per Liter (mmol/L)Standard Deviation 1.7599
Metformin IRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 4 (n= 240, 239)-1.558 Millimole Per Liter (mmol/L)Standard Deviation 1.6245
Metformin IRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 16 (n= 214, 218)-1.976 Millimole Per Liter (mmol/L)Standard Deviation 1.7529
Metformin IRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Baseline (n=251, 254)8.464 Millimole Per Liter (mmol/L)Standard Deviation 1.747
Metformin XRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 16 (n= 214, 218)-2.183 Millimole Per Liter (mmol/L)Standard Deviation 1.8481
Metformin XRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Baseline (n=251, 254)8.690 Millimole Per Liter (mmol/L)Standard Deviation 2.0977
Metformin XRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 1 (n= 249, 248)-0.736 Millimole Per Liter (mmol/L)Standard Deviation 1.4305
Metformin XRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 2 (n= 243, 244)-1.267 Millimole Per Liter (mmol/L)Standard Deviation 1.9346
Metformin XRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 4 (n= 240, 239)-1.604 Millimole Per Liter (mmol/L)Standard Deviation 1.7971
Metformin XRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 8 (n= 219, 230)-1.999 Millimole Per Liter (mmol/L)Standard Deviation 2.0192
Metformin XRChange From Baseline in Fasting Plasma Glucose (FPG) Level at Week 1, 2, 4, 8, 12 and 16Change at Week 12 (n= 216, 221)-2.048 Millimole Per Liter (mmol/L)Standard Deviation 1.8532
Secondary

Percentage of Subjects Who Are Compliant to Treatment

Compliance was defined as not skipping or forgetting dosing or not delaying the dosing time. Subjects who never missed a dose of medication were considered compliant.

Time frame: Baseline up to Week 16

Population: The safety population included all subjects who received at least 1 dose of trial treatment.

ArmMeasureValue (NUMBER)
Metformin IRPercentage of Subjects Who Are Compliant to Treatment99.2 percentage of subjects
Metformin XRPercentage of Subjects Who Are Compliant to Treatment99.2 percentage of subjects
Secondary

Percentage of Subjects Who Are Totally Intolerant to the Treatment

Subjects were considered to be totally intolerant if they experienced a Grade 3 or higher toxicity considered at least possibly related to the treatment.

Time frame: Baseline up to Week 16

Population: The safety population included all subjects who received at least 1 dose of trial treatment.

ArmMeasureValue (NUMBER)
Metformin IRPercentage of Subjects Who Are Totally Intolerant to the Treatment7.3 percentage of subjects
Metformin XRPercentage of Subjects Who Are Totally Intolerant to the Treatment5.7 percentage of subjects
Secondary

Percentage of Subjects With HbA1c Less Than (<) 7%

Time frame: Baseline up to Week 16

Population: ITT population included all subjects who were randomly allocated to a treatment based on the intention to treat.

ArmMeasureValue (NUMBER)
Metformin IRPercentage of Subjects With HbA1c Less Than (<) 7%68.5 percentage of subjects
Metformin XRPercentage of Subjects With HbA1c Less Than (<) 7%69.8 percentage of subjects
Secondary

Percentage of Subjects With HbA1c Less Than (<) 7% and With no Severe Gastrointestinal (GI) and Other Adverse Events (AEs)

Percentage of subjects with HbA1c \<7% and with no severe GI and other AEs were reported. Severe adverse events were based on Common Terminology Criteria for Adverse Events (CTCAE), version 4.0 and were defined as those events which were medically significant but not immediately life-threatening; hospitalization or prolongation of hospitalization indicated; disabling; limiting self-care activities of daily living (ADL). Self-care ADL refer to bathing, dressing and undressing, feeding self, using the toilet, taking medications, and not bedridden.

Time frame: Baseline up to Week 16

Population: ITT population included all subjects who were randomly allocated to a treatment based on the intention to treat.

ArmMeasureValue (NUMBER)
Metformin IRPercentage of Subjects With HbA1c Less Than (<) 7% and With no Severe Gastrointestinal (GI) and Other Adverse Events (AEs)68.2 percentage of subjects
Metformin XRPercentage of Subjects With HbA1c Less Than (<) 7% and With no Severe Gastrointestinal (GI) and Other Adverse Events (AEs)69.8 percentage of subjects
Secondary

Percentage of Subjects With Hypoglycemia

Hypoglycemia, also called as low blood glucose or low blood sugar, is defined as the blood glucose level of less than normal (that is less than 3.9 millimole per liter \[mmol/L\]).

Time frame: Baseline up to Week 16

Population: The safety population included all subjects who received at least 1 dose of trial treatment.

ArmMeasureValue (NUMBER)
Metformin IRPercentage of Subjects With Hypoglycemia1.1 percentage of subjects
Metformin XRPercentage of Subjects With Hypoglycemia3.0 percentage of subjects
Secondary

Percentage of Subjects With Marked Hyperglycemia

Marked hyperglycemia was defined as the FPG level of greater than or equal to 11.1 mmol/L.

Time frame: Baseline up to Week 16

Population: ITT population included all subjects who were randomly allocated to a treatment based on the intention to treat.

ArmMeasureValue (NUMBER)
Metformin IRPercentage of Subjects With Marked Hyperglycemia0.7 percentage of subjects
Metformin XRPercentage of Subjects With Marked Hyperglycemia2.3 percentage of subjects
Secondary

Percentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment Period

An adverse event (AE) was defined as any untoward medical occurrence in a subject which does not necessarily have a causal relationship with the treatment. An AE was any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease temporally associated with use of a medicinal product, whether or not considered related to the medicinal product. Number of subjects with pre-specified gastrointestinal adverse events (diarrhea, nausea, abdominal pain, bloating, constipation, dyspepsia and flatulence) were reported.

Time frame: Baseline up to Week 16

Population: The safety population included all subjects who received at least 1 dose of trial treatment.

ArmMeasureGroupValue (NUMBER)
Metformin IRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodNausea6.1 percentage of subjects
Metformin IRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodConstipation1.9 percentage of subjects
Metformin IRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodAbdominal Distension6.1 percentage of subjects
Metformin IRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodDyspepsia1.1 percentage of subjects
Metformin IRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodAbdominal Pain2.3 percentage of subjects
Metformin IRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodFlatulence0.4 percentage of subjects
Metformin IRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodDiarrhoea16.5 percentage of subjects
Metformin XRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodFlatulence0 percentage of subjects
Metformin XRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodDiarrhoea12.5 percentage of subjects
Metformin XRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodAbdominal Distension6.4 percentage of subjects
Metformin XRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodNausea4.5 percentage of subjects
Metformin XRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodAbdominal Pain1.9 percentage of subjects
Metformin XRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodConstipation1.9 percentage of subjects
Metformin XRPercentage of Subjects With Pre-specified Gastrointestinal Adverse Events During Treatment PeriodDyspepsia0.8 percentage of subjects

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026