A controlled trial of imipramine for the treatment of methamphetamine dependence.
At the Drug Detoxification Program of the Haight Ashbury Free Clinics, we conducted a randomized clinical trial of imipramine in the treatment of methamphetamine dependence. The purposes of the trial were to test the efficacy of imipramine as a treatment for methamphetamine dependence and to establish the feasibility of conducting a controlled clinical trial at the Clinic. Thirty-two subjects were randomly assigned to receive either 10 or 150 mg/day of imiprine for 180 days. Imipramine 10 mg/day was the control. Subjects received intensive counseling. Retention in treatment was significantly longer for subjects who were treated with 150 mg of imipramine compared to control (median days: 33.0 vs. 10.5). There were no consistent differences in percent of urine samples positive for methamphetamine, Beck Depression Inventory scores, or craving. Determination of the full extent of imipramine's utility in the treatment of methamphetamine dependence awaits a larger trial.
Fluoxetine, amlodipine, imipramine and desipramine have very limited benefits for amphetamine dependence and abuse. Fluoxetine may decrease craving in short-term treatment. Imipramine may increase duration of adherence to treatment in medium-term treatment. Apart from these, no other benefits can be found. This limited evidence suggests that no treatment has been demonstrated to be effective for the treatment of amphetamine dependence and abuse.
Although there is a large number of people with amphetamine dependence and abuse worldwide, very few controlled trials in this issue have been conducted. As the previous treatment trials show no promising result, other treatments, both biological and psychosocial, should be further investigated. However, the results of neurotoxic studies of amphetamines are also crucial for the study designs appropriate for further treatment studies for amphetamine dependence and abuse.