Healthy
Conditions
Keywords
LSD, Serotonin, Psychedelics
Brief summary
The main objective of this study is to determine whether administration of ketanserin (40 mg), olanzapine (10 mg), and lorazepam (2 mg) after administration of LSD (150 µg) attenuates and shortens the subjective LSD response (any drug effect) compared to administration of LSD (150 µg) alone
Detailed description
LSD is investigated as treatment for various psychiatric (e.g., depression and anxiety) but also somatic disorders (e.g., cluster headache). In Switzerland, compassionate use of psychedelics including LSD is possible based on single authorizations of the federal office of public health in treatment-resistant patients. Additionally, current social and political changes demonstrate a shift of how psychedelics are seen and how they might be used in therapy in the future. Despite the good safety profile of LSD, a broader use might increase the number of adverse psychological reactions to LSD. For such occasions, health professionals should have a tool to not only psychologically but also pharmacologically interfere and end states of acute psychedelic-induced distress. In clinical practice, the gamma-butyric acid (GABA) agonistic acting benzodiazepine lorazepam or the atypical neuroleptic olanzapine with affinity to the 5-HT2A, 5-HT2C and dopamine D1-4 receptors are primarily used for the treatment of drug-induced psychotic symptoms. However, the ability of these drugs to block these effects after LSD intake remains to be investigated. The primary goal of the present study is therefore to investigate whether ketanserin, olanzapine and lorazepam administration after LSD administration might attenuate and shorten the LSD response compared to administration of LSD alone. Additionally, the present study examines changes in quality of the LSD experience after administration of ketanserin, olanzapine or lorazepam and effects on sensorimotor gating and sleep. The study provides insight into the receptor mechanisms involved in alterations of consciousness and specifically the relevance of ongoing 5-HT2A receptor stimulation in the mediation of the psychedelic response to LSD and psychotic symptoms.
Interventions
DRUGLSD (150 µg) + ketanserin (40 mg)
Drug: LSD (150 µg) per os, single dose Other: Ketanserin (40 mg) per os, single dose
DRUGLSD (150 µg) + olanzapine (10 mg)
Drug: LSD (150 µg) per os, single dose Other: Olanzapine (10 mg) per os, single dose
DRUGLSD (150 µg) + lorazepam (2 mg)
Drug: LSD (150 µg) per os, single dose Other: Lorazepam (2 mg) per os, single dose
DRUGLSD (150 µg) + placebo
Drug: LSD (150 µg) per os, single dose Other: Placebo (Capsules containing mannitol looking identical to the other drugs)
Drug: Placebo (Capsules containing mannitol looking identical to the other drugs) Other: Placebo (Capsules containing mannitol looking identical to the other drugs)
Sponsors
University Hospital, Basel, Switzerland
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
BASIC_SCIENCE
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Intervention model description
Crossover Assignment
Eligibility
Sex/Gender
ALL
Age
25 Years to 65 Years
Healthy volunteers
Yes
Inclusion criteria
1. Age between 25 and 65 years 2. Sufficient understanding of the German language 3. Understanding of procedures and risks associated with the study 4. Willing to adhere to the protocol and signing of the consent form 5. Willing to refrain from the consumption of illicit psychoactive substances during the study 6. Abstaining from xanthine-based liquids and foods from the evenings prior to the study sessions to the end of the study days, limit coffee drinking ≤ 3 cups per day for 7 days prior to study day 7. Participants must be willing not to drive a traffic vehicle or to operate machines within 48 h after substance administration 8. Willing to use effective contraceptive measures throughout study participation (according to Clinical Trial Facilitation Group (CTFG): Recommendations related to contraception and pregnancy testing in clinical trials) 9. Women of childbearing potential must have a negative pregnancy test at the beginning of the study. Pregnancy tests are repeated before each study session. 10. Body mass index between 18 - 29 kg/m2
Exclusion criteria
1. Chronic or acute medical condition 2. Current or previous major psychiatric disorder including psychotic disorder, mania / hypomania, borderline personality disorders. 3. Psychotic disorder or bipolar disorder in first-degree relatives 4. Known hypersensitivity to LSD, ketanserin, olanzapine or lorazepam 5. Hypertension (\>140/90 mmHg) or hypotension (SBP \< 85 mmHg) 6. Hallucinogenic substance use (not including cannabis) more than 10 times or any time within the previous two months 7. Pregnancy or current breastfeeding 8. Participation in another clinical trial (currently or within the last 30 days) 9. Use of medication that may interfere with the effects of the study medication 10. Current substance use disorder (within the last 2 months) 11. Tobacco smoking (\>1 cigarette/day) 12. Consumption of alcoholic beverages (\>15 drinks/week) 13. Not exhibiting consistent startle responding on the screening day (i.e., over 75% discernible responses to six 108 dB 40 ms startle pulses), as this would preclude the ability to measure fear potentiated startle. 14. Use of strong CYP2D6 inhibitor 15. Use of strong CYP1A2 inhibitor or inducer
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Duration of subjective response | 18 months | Visual Analog Scales (VAS) will be repeatedly used to assess subjective alterations in consciousness over time. VAS will be presented as 100 mm long horizontal lines marked with: not at all on the left and any drug effect, good drug effect, bad drug effect, stimulated, tiredness, fear, nausea, alteration of vision, alteration of hearing, sounds seem to influence what I see, alteration of sense of time, the boundaries between myself and my surroundings seem to blur, I gain insights into contexts that were previously mysterious to me, opposites dissolve, talkative, happy, and trust. Additionally, my perception is… from muted to clear, I feel … from relaxed to tense, and I feel my thoughts are … from sluggish to racing. Subjects will mark the scale with vertical lines. |
| Extent of subjective response | 18 months | Area under the curve (AUEC), Emax, of the VAS-Item any drug effect |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Subjective effects I | 18 months | Visual Analog Scales (VAS) will be repeatedly used to assess subjective alterations in consciousness over time. VAS will be presented as 100 mm long horizontal lines marked with: not at all on the left and any drug effect, good drug effect, bad drug effect, stimulated, tiredness, fear, nausea, alteration of vision, alteration of hearing, sounds seem to influence what I see, alteration of sense of time, the boundaries between myself and my surroundings seem to blur, I gain insights into contexts that were previously mysterious to me, opposites dissolve, talkative, happy, and trust. Additionally, my perception is… from muted to clear, I feel … from relaxed to tense, and I feel my thoughts are … from sluggish to racing. Subjects will mark the scale with vertical lines. |
| Subjective effects II | 18 months | Adjective Mood Rating Scale (AMRS) assesses the occurrence and intensity of 60 moods on a 4-point Likert scale ranging from not at all to extremely. |
| Subjective effects III | 24 hours | The Addiction Research Center Inventory (ARCI) is a true-false questionnaire with five empirically derived scales. The scale is administered once before, after 3 h, 10 h, and 24 h after LSD administration. |
| Psychotomimetic effects I | 18 months | The aberrant salience inventory (ASI) is a 29-item questionnaire rated as yes or no measuring trait aberrant salience, which has been hypothesized to be important for psychosis and psychotic disorders. The questionnaire will be administered once at the end of the session and subjects will be instructed to retrospectively rate peak alterations during the study session. |
| Psychotomimetic effects II | 18 months | The psychotomimetic states inventory (PSI) consists of 48 items measuring psychosis-like experiences and is one of the most widely used measure of drug-induces psychotic-like effects. Items will be scored on a 4-point scale (0 = never to 3 = strongly). The questionnaire will be administered once at the end of the session and subjects will be instructed to retrospectively rate peak alterations during the study session. |
| Effects of LSD on mindfulness and decentering I | 36 hours | The 39-item Five Facet Mindfulness Questionnaire (FFMQ) measures five facets of a general tendency to be mindful in daily life. The FFMQ will be completed by the participants at screening, the beginning of each study session (to assess respective baseline) and will be handed in to the participants at the end of the respective study visit and participants will be asked to complete the FFMQ at home 36 h after the study drug has been administered. |
| Effects of LSD on mindfulness and decentering II | 36 hours | The 20-item Experience Questionnaire (EQ) measures decentering and ruminating. Decentering is defined as looking at one's own feelings from a distance, in an observing and objective way. The EQ will be completed by the participants at screening, at the beginning of each study session (to assess respective baseline) and will be handed in to the participants at the end of the respective study visit, and participants will be asked to complete the EQ at home 36 h after the study drug has been administered |
| Challenging experiences | 18 months | The Challenging Experiences Questionnaire (CEQ) was developed to characterize challenging experiences with psilocybin. The 26-item questionnaire is rated on a 6-point Likert scale ranging from 0 (none, not at all) to 5 (extreme, more than ever before in my life). The CEQ includes seven factors: Fear; Grief; Physical Distress; Insanity; Isolation; Death; Paranoia, and a total score (Total) is calculated over all items. 9. The validated German version of the CEQ 153 will be administered once at the end of the session and subjects will be instructed to retrospectively rate their experiences during peak alterations during the study session. |
| Effects on prepulse inhibition and sensorimotor gating | 18 months | Prepulse inhibition (PPI) of the acoustic startle response is an operational measure of sensorimotor gating that can be measured in animals and humans and serves as a preclinical model for schizophrenia. LSD and other serotonergic 5-HT2A agonists disrupt PPI in animals and in humans and PPI is also disrupted in schizophrenic patients. We will measure effects of LSD on sensorimotor gating function. |
| Blood pressure | 18 months | Blood pressure, assessed 21 times during each study session via systolic and diastolic blood pressure. |
| Heart rate | 18 months | Heart rate, assessed 21 times during each study session via heart rate, Emax. |
| Body temperature | 18 months | Body temperature assessed 20 times during each study session via tympanic body temperature. |
| Pupil size | 18 months | Pupil size, assessed 8 times during each study session via pupilometer. |
| Alterations of consciousness | 18 months | Altered States of Consciousness 5 Dimensions of Altered States of Consciousness (5D-ASC) assesses mood, anxiety, derealization, depersonalization, changes in perception, auditory alterations, and reduced vigilance. The questionnaire is consisting of 94 items to be rated on a visual analog scale (horizontal line, 100 mm, marked with not at all on the left and extremely on the right), with higher values indicating stronger effects. Subjects will mark the scale with vertical lines. |
| Ketanserin concentrations in the blood | 18 months | Ketanserin concentrations measured in the blood plasma, assessed 17 times during each study session via blood samples. |
| Olanzapine concentrations in the blood | 18 months | Olanzapine concentrations measured in the blood plasma, assessed 17 times during each study session via blood samples. |
| Lorazepam concentrations in the blood | 18 months | Lorazepam concentrations measured in the blood plasma, assessed 17 times during each study session via blood samples. |
| Effects of LSD on sleep phases | 11 hours | The Dreem® headband will record electroencephalographic (EEG; five dry electrodes yielding seven derivations), acceleration (3D accelerometer), and heart rate (red-infrared pulse oximeter) activity. We will further calculate sleep variables of %REM (REM sleep duration divided by total sleep duration), REM Latency (duration of non-REM sleep before the first REM phase), and REM Efficiency (REM sleep duration divided by the total REM episode duration) for each night. We will start the measurement 11 h after LSD administration until the end of the study day. |
| Persisting effects | 18 months | The 143-item Johns Hopkins University Persisting Effects Questionnaire (PEQ) seeks information about changes in attitude, mood, behavior, and spiritual experience items are rated on a six-point scale. The PEQ will be administered at the EOS visit. |
| Adverse effects | 18 months | The adapted list of complaints (LC) consists of 50 items offering a global score measuring physical and general discomfort. The LC list is administered before, 12 h after LSD administration with reference to all complaints arising since the LSD administration, and at the end of the session with reference to complaints throughout the night. Subjects will additionally be asked to report any adverse events during the sessions or/and between study sessions as assessed at the beginning of the next session and at the EOS visit. |
| Emotional effects | 18 months | Multifaceted Empathy Test (MET), effects on empathy in computer tests, assessed one time during each study session. |
| Sleepiness | 18 months | The Karolinska Sleepiness Scale (KSS) measures the subjective level of sleepiness 161. The scale shows a 10-point scale from 1 - extremely alert to 10 - extremely sleepy - cannot stay awake. The KSS will be assessed at the beginning and repeatedly in the evening and next morning of the study session |
| Effect moderation through personality traits I | 18 months | Assessed one time during the screening via the NEO-Five-Factor-Inventory (NEO-FFI). The NEO-FFI assesses 5 personality traits (openness to experience, conscientiousness, extraversion, agreeableness and neuroticism) consisting of of 60 items. Each item is evaluated on a scale from -- strong disagreement to ++ strong agreement. |
| Effect moderation through personality traits II | 18 months | Assessed one time during the screening via Freiburger Personality Inventory (FPI). The FPI-R version comprises 138 items and covers 12 dimensions of personality: life satisfaction, social orientation, performance orientation, inhibition, excitability, aggressiveness, stress, physical complaints, health concerns, openness, as well as the secondary factors according to Eysenck's Extraversion and Emotionality (Neuroticism). It uses a 2-point scale (true and not true). |
| Effect moderation through personality traits III | 18 months | Assessed one time during the screening via Saarbrücker Personality Questionnaire (SPF). The SPF defines empathy as the reactions of one individual to the observed experiences of another. It assesses 28-items on a 5-point Likert scale ranging from Does not describe me well to Describes me very well. The measure has 4 subscales (Perspective Taking, Fantasy, Empathic Concern, Personal Distress) each made up of 7 different items. |
| Effect moderation through personality traits IV | 18 months | Assessed one time during the screening via HEXACO personality inventory (Honesty-Humility, Emotionality, Extraversion, Agreeableness, Conscientiousness, and Openness). The HEXACO consists of 100 items. Each item is evaluated on a scale from 1 strong disagreement to 5 strong agreement. |
| Effect moderation through personality traits V | 18 months | Assessed one time during the screening via Defense Style Questionnaire (DSQ-40). The DSQ-40 can provide scores for 20 individual defenses, and scores for the three factors mature, neurotic, and immature. Each item is evaluated on a scale from 1 to 9, where 1 indicates completely disagree and 9 indicates fully agree. |
| LSD concentrations in the blood | 18 months | LSD and metabolites concentrations measured in the blood plasma, assessed 17 times during each study session via blood samples. |
| Mystical-type effects | 18 months | Mystical-type experience questionnaire (MEQ) assesses with 30 items (embedded into the SCQ) the mystical experiences on a 6-point Likert scale ranging from 0 (not at all) to 5 (extremely). |
Countries
Switzerland
Outcome results
None listed