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Safety, tolerability and pharmacokinetics of single and multiple doses of a novel sigma-1 receptor antagonist in three randomized phase I studies.

ABSTRACT: AIM: To assess the safety, tolerability, pharmacodynamics and pharmacokinetics in healthy subjects of a novel, highly selective, sigma-1 receptor antagonist (S1RA). METHODS: Three randomized, double-blind, placebo-controlled trials evaluated single oral doses (5-500 mg, study 101; 500-800 mg, study 106) and multiple doses (50-400 mg once daily for 8 days, study 102) of S1RA. Safety and tolerability were assessed by adverse event reporting, clinical laboratory, physical examinations, vital signs and electrocardiography, including Holter monitoring. Pharmacodynamic assessments included computerized cognitive testing. Plasma samples were analyzed using validated HPLC-MS/MS methods. RESULTS: One hundred and seventy-five subjects were enrolled. Single and multiple doses were safe and well tolerated, with no serious adverse events. The most common side effects were headache and dizziness. The highest single doses were associated with some mild to moderate transient CNS effects. The maximum tolerated dose was not reached. There were no clinically significant changes in the electrocardiogram (ECG), 24 h Holter monitoring, or in vital signs and laboratory assessments. Subjective CNS pharmacodynamics evaluations showed no relevant differences vs. placebo. Cognitive testing showed no effects on visual memory, executive function, attention or somnolence, while revealing some transient slowing of response for simple reaction time and choice reaction time at 2 h following the administration of higher doses. A fast absorption, rapid distribution and slow elimination were observed (t(max) 0.75-2.0 h, t(1/2) compatible with once a day administration) and steady-state was reached. No gender differences were observed. CONCLUSIONS: S1RA exhibited an acceptable safety, tolerability, pharmacodynamic and pharmacokinetic profile in healthy subjects over the dose range studied.

SUBMITTER: Abadias M

PROVIDER: S-EPMC3555050 | biostudies-literature | 2013 Jan

REPOSITORIES: biostudies-literature

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Safety, tolerability and pharmacokinetics of single and multiple doses of a novel sigma-1 receptor antagonist in three randomized phase I studies.

Abadias Montserrat M Escriche Marisol M Vaqué Anna A Sust Mariano M Encina Gregorio G

British journal of clinical pharmacology 20130101 1

<h4>Aim</h4>To assess the safety, tolerability, pharmacodynamics and pharmacokinetics in healthy subjects of a novel, highly selective, sigma-1 receptor antagonist (S1RA).<h4>Methods</h4>Three randomized, double-blind, placebo-controlled trials evaluated single oral doses (5-500 mg, study 101; 500-800 mg, study 106) and multiple doses (50-400 mg once daily for 8 days, study 102) of S1RA. Safety and tolerability were assessed by adverse event reporting, clinical laboratory, physical examinations, ...[more]

PMID: 22607269

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Project description:Background and objectiveVidofludimus is a potent and selective inhibitor of human mitochondrial enzyme dihydroorotate dehydrogenase (DHODH). The clinical efficacy and safety profile of vidofludimus has been analyzed in patients suffering from rheumatoid arthritis and Crohn's disease and ulcerative colitis. In previous sudies, hematuria at higher doses occurred in close temporal relationship to vidofludimus administration and appeared to be dose related. The present report describes the results from two phase 1 studies conducted in healthy male subjects to investigate the safety, tolerability and pharmacokinetics after single and multiple ascending (SAD and MAD) oral doses of IMU-838 (vidofludimus calcium, tablets containing a specific polymorph). The effect of food on the pharmacokinetics of IMU-838 was also assessed in the SAD study.MethodsIn the SAD study, 12 subjects received single doses of IMU-838 under fasting (10-40 mg) or fed (10 mg) condition in an open-label, partial parallel group design. In the MAD study, 52 subjects received multiple doses of IMU-838 (30-50 mg) in a double-blind, placebo-controlled, parallel group design.ResultsIMU-838 showed dose-proportional pharmacokinetics after single and multiple oral dosing in both SAD and MAD studies. IMU-838 was well absorbed after single daily doses. Food did not impact the pharmacokinetics of IMU-838. The accumulation factor for multiple daily dosing was approximately 2. Steady-state concentrations were reached within about 6-8 days for 30-50 mg groups. The geometric mean plasma half-life of IMU-838 at steady state was approximately 30 h, which supports its use for once-daily dosing regimen. Single and multiple oral doses of IMU-838 were safe and well tolerated.ConclusionOverall, oral IMU-838 was generally well tolerated in SAD and MAD studies in healthy subjects over a wide dose range of 10-50 mg. IMU-838 was well absorbed after single daily doses. IMU-838 showed dose proportional pharmacokinetics after single and multiple oral dosing.

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Safety, tolerability and pharmacokinetics of single and multiple doses of a novel sigma-1 receptor antagonist in three randomized phase I studies.

Publications

Safety, tolerability and pharmacokinetics of single and multiple doses of a novel sigma-1 receptor antagonist in three randomized phase I studies.

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