Dataset Information

Pharmacokinetics and Pharmacodynamics of Lysergic Acid Diethylamide in Healthy Subjects.

ABSTRACT: Lysergic acid diethylamide (LSD) is used recreationally and in clinical research. The aim of the present study was to characterize the pharmacokinetics and exposure-response relationship of oral LSD.We analyzed pharmacokinetic data from two published placebo-controlled, double-blind, cross-over studies using oral administration of LSD 100 and 200 µg in 24 and 16 subjects, respectively. The pharmacokinetics of the 100-µg dose is shown for the first time and data for the 200-µg dose were reanalyzed and included. Plasma concentrations of LSD, subjective effects, and vital signs were repeatedly assessed. Pharmacokinetic parameters were determined using compartmental modeling. Concentration-effect relationships were described using pharmacokinetic-pharmacodynamic modeling.Geometric mean (95% confidence interval) maximum plasma concentration values of 1.3 (1.2-1.9) and 3.1 (2.6-4.0) ng/mL were reached 1.4 and 1.5 h after administration of 100 and 200 µg LSD, respectively. The plasma half-life was 2.6 h (2.2-3.4 h). The subjective effects lasted (mean ± standard deviation) 8.2 ± 2.1 and 11.6 ± 1.7 h for the 100- and 200-µg LSD doses, respectively. Subjective peak effects were reached 2.8 and 2.5 h after administration of LSD 100 and 200 µg, respectively. A close relationship was observed between the LSD concentration and subjective response within subjects, with moderate counterclockwise hysteresis. Half-maximal effective concentration values were in the range of 1 ng/mL. No correlations were found between plasma LSD concentrations and the effects of LSD across subjects at or near maximum plasma concentration and within dose groups.The present pharmacokinetic data are important for the evaluation of clinical study findings (e.g., functional magnetic resonance imaging studies) and the interpretation of LSD intoxication. Oral LSD presented dose-proportional pharmacokinetics and first-order elimination up to 12 h. The effects of LSD were related to changes in plasma concentrations over time, with no evidence of acute tolerance.NCT02308969, NCT01878942.

SUBMITTER: Dolder PC

PROVIDER: S-EPMC5591798 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature

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Pharmacokinetics and Pharmacodynamics of Lysergic Acid Diethylamide in Healthy Subjects.

Dolder Patrick C PC Schmid Yasmin Y Steuer Andrea E AE Kraemer Thomas T Rentsch Katharina M KM Hammann Felix F Liechti Matthias E ME

Clinical pharmacokinetics 20171001 10

<h4>Background and objective</h4>Lysergic acid diethylamide (LSD) is used recreationally and in clinical research. The aim of the present study was to characterize the pharmacokinetics and exposure-response relationship of oral LSD.<h4>Methods</h4>We analyzed pharmacokinetic data from two published placebo-controlled, double-blind, cross-over studies using oral administration of LSD 100 and 200 µg in 24 and 16 subjects, respectively. The pharmacokinetics of the 100-µg dose is shown for the first ...[more]

PMID: 28197931

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Project description:Study objectiveTo investigate the pharmacodynamic and pharmacokinetic profiles of fluticasone furoate (FF)/vilanterol (VI) - a fixed-dose combination of an inhaled corticosteroid (ICS) and a long-acting β2 -agonist for the treatment of asthma and chronic obstructive pulmonary disease - after single and repeat administration in healthy Chinese subjects.DesignDouble-blind, placebo-controlled, single-site, randomized, four-way crossover study.SettingThe Clinical Pharmacological Research Centre at Peking Union Medical College Hospital [PUMCH]) in Beijing, China.SubjectsSixteen healthy, nonsmoking Chinese adults.InterventionSubjects were randomized to receive FF/VI 50/25, 100/25, or 200/25 μg, or placebo once/daily in the morning, delivered by the Ellipta dry powder inhaler, for 7 consecutive days. The subjects then received the other three treatments, with each treatment period separated by a 7-day washout period.Measurements and main resultsThe co-primary outcome measures reflected pharmacodynamic responses relating to recognized class effects of the two drug classes: reduced serum cortisol level (ICSs), and increased Fridericia's corrected QT interval (QTcF) and reduced serum potassium level (long-acting β2 -agonists). Co-primary pharmacodynamic endpoints were 0-24-hour weighted mean serum cortisol level on day 7 (cortisol0-24 hr, Day 7 ), and 0-4-hour weighted mean and maximum QTcF and weighted mean and minimum serum potassium level on days 1 and 7. Fluticasone furoate and VI plasma concentrations, derived pharmacokinetic parameters, and safety were also assessed. Of the 16 subjects randomized, 15 completed the study. Reductions in cortisol0-24 hour, Day 7 of 15% and 25% were observed with FF/VI 100/25 and 200/25 μg, respectively, versus placebo. Minor increases (< 10 msec) in maximum QTcF on day 7 were seen with FF/VI 50/25 and 100/25 μg but not with 200/25 μg. Slight decreases in serum potassium level were only observed in subjects receiving FF/VI 50/25 μg on day 1 and FF/VI 50/25 and 200/25 μg on day 7. Fluticasone furoate accumulation (day 7 vs day 1) for FF/VI 50/25-200/25 μg ranged from 38 to 54% for maximum observed concentration and 63-71% for area under the concentration-time curve from 0 to 4 hours. Fluticasone furoate pharmacokinetics were less than dose proportional. The VI pharmacokinetic profiles were similar for all three FF/VI doses. Adverse events were all mild in intensity and were reported by 13 (81%) of the 16 subjects.ConclusionIn healthy Chinese subjects, minimal and non-clinically relevant β-adrenergic pharmacodynamic effects were observed with FF/VI doses ranging from 50/25 to 200/25 μg. FF dose-dependent reductions in serum cortisol levels of 15-25% were seen after administration of FF/VI 100/25 and 200/25 μg. FF/VI was safe and well tolerated in these subjects at doses ranging from 50/25 to 200/25 μg.

Dataset Information

Pharmacokinetics and Pharmacodynamics of Lysergic Acid Diethylamide in Healthy Subjects.

Publications

Pharmacokinetics and Pharmacodynamics of Lysergic Acid Diethylamide in Healthy Subjects.

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