Safety and Efficacy Study of Vigabatrin to Treat Methamphetamine Dependence

Phase 2

Terminated

• Conditions: Methamphetamine Dependence
• Interventions: Drug: CPP-109 vigabatrin; Drug: Matching Placebo

• Registration Number: NCT00730522
• Lead Sponsor: Catalyst Pharmaceuticals, Inc.

Brief Summary

The objective of this study is to demonstrate that a larger proportion of vigabatrin-treated subjects than placebo-treated subjects will be methamphetamine-free in the last 2 weeks of the study's Treatment Phase (Weeks 11 and 12).

Detailed Description

This is a Phase II, randomized, double-blind, placebo-controlled, intent-to-treat, 2-arm, parallel design, multicenter study to evaluate vigabatrin as a treatment for methamphetamine addiction. The study will involve approximately 180 subjects (90/group) who meet DSM IV criteria for methamphetamine dependence. Subjects will be evaluated for their compliance with protocol inclusion/exclusion criteria during Screening/Baseline Phase, lasting up to 4 weeks.

At the conclusion of the Screening/Baseline Phase, subjects meeting all inclusion/exclusion criteria will be randomized to one of two treatment groups: vigabatrin or placebo. Subjects will proceed to a 12 week Treatment Phase and then undergo a 12 week follow-up period. Subjects will be scheduled for clinic visits 3 times per week for efficacy and/or safety assessments during the Screening/Baseline Phase and the 12 week Treatment Phase. Subjects will return for follow up visits at Weeks 13, 16, 20 and 24.

Study Timeline

• Study Start: 2008-07
• Study First Submitted: 2008-08-05
• Study First Submitted QC: 2008-08-05
• Study First Posted: 2008-08-08
• Primary Completion: 2009-06
• Study Completion: 2009-11
• Status Verified: 2020-10
• Results First Submitted: 2020-10-27
• Results First Submitted QC: 2020-12-08
• Last Update Submitted: 2020-12-08
• Results First Posted: 2020-12-09
• Last Update Posted: 2020-12-09

Recruitment & Eligibility

• Status: TERMINATED
• Sex: All
• Target Recruitment: 55

Inclusion Criteria

Able to understand the study and provide written informed consent.

• Male or female at least 18 years of age.
• Meets DSM-IV (Diagnostic and Statistical Manual of Mental Disorders Fourth Edition) criteria for methamphetamine dependence as major diagnosis, as determined by the Substance Abuse module of SCID (Structured Clinical Interview for DSM-IV).
• Provides at least one urine specimen which is positive for methamphetamine according to a rapid screening test.
• Seeking treatment for methamphetamine dependence.
• Have normal visual fields.
• Be in generally good health based on history, physical examination and laboratory findings.
• If female of childbearing potential, use acceptable contraceptive methods

Exclusion Criteria

• Has current dependence on any psychoactive substance other than methamphetamine, alcohol, nicotine, or cannabinoid or physiologic dependence on alcohol requiring medical detoxification.
• Has any serious medical or psychiatric illness and/or clinically significant abnormal laboratory values.
• Has history of serious cardiovascular reaction to methamphetamine.
• Has clinically significant cardiovascular impairment, abnormal ECG or uncontrolled hypertension.
• Be under court or other governmental agency (e.g. social services) mandate to obtain treatment or requiring outside urine monitoring.
• Be enrolled in an opiate substitution treatment program within 2 months of randomization.
• Has ever taken vigabatrin in the past.
• Is pregnant or lactating.
• Has clinically significant ophthalmologic disease, which would preclude safety monitoring, is undergoing treatment for ocular disease or intends to have any ocular surgery or procedure performed during the time of their participation in the trial.
• Has received a drug with known major organ toxicity, including retinotoxicity.
• Is currently participating in, or has been enrolled in another clinical trial within the last 30 days.
• Be anyone who, in the judgment of the investigator, would not be expected to attend regular study visits or to complete the study protocol.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
1	CPP-109 vigabatrin	CPP-109 vigabatrin tablets
2	Matching Placebo	Matching Placebo Tablets

Primary Outcome Measures

Name	Time	Method
The Proportion of Subjects in Each Treatment Group Who Are Amphetamine Abstinent During the Last 2 Weeks of the Treatment Phase (Weeks 11 and 12).	Weeks 11-12

Secondary Outcome Measures

Name	Time	Method
• Number of Methamphetamine Negative Urines During the Treatment Phase • Number of Methamphetamine Use Weeks During the Treatment Phase.	Weeks 1-12

Trial Locations

Locations (8)

South Bay Treatment Center; 🇺🇸 San Diego, California, United States

North County Clinical Research (NCCR); 🇺🇸 Oceanside, California, United States

Addiction Pharmacology Research Laboratory, St. Luke's Hospital; 🇺🇸 San Francisco, California, United States

START Research and Treatment; 🇺🇸 Kansas City, Missouri, United States

Behavioral Health Research Center of the Southwest; 🇺🇸 Albuquerque, New Mexico, United States

Pahl Pharmaceutical Research; 🇺🇸 Oklahoma City, Oklahoma, United States

Pillar Research; 🇺🇸 Dallas, Texas, United States

Creighton University Medical Center; 🇺🇸 Omaha, Nebraska, United States