Quetiapine Pharmacotherapy for Cannabis Dependence

In a 12-week randomized double-blind placebo-controlled clinical trial, we will evaluate the efficacy of quetiapine for the treatment of marijuana dependence in 150 outpatients. Participants will be randomly assigned to treatment under double-blind conditions with either a fixed dosing schedule of quetiapine or placebo. All participants will receive Medical Management, a medication adherence focused psychosocial intervention that facilitates compliance with study medication and other study procedures, and promotes abstinence from marijuana and other substances. All participants will receive progressive voucher incentives for compliance with study visit attendance and completing other study procedures, with the objective of achieving a highly compliant sample.

The results of a dose-finding pilot study of quetiapine for the treatment of marijuana dependence (see Preliminary Studies) suggests that the ideal dosing for the proposed project is a single 300 mg dose every evening, achieved after a gradual three-week titration. Clinical experience with this medication for treatment of marijuana dependence indicates that a gradual upward titration of dose is advisable to maximize tolerability and that morning dosing was poorly tolerated. Quetiapine (immediate release formulation) will be administered in 25 and 100 mg capsules; placebo capsules will appear identical to the quetiapine capsules. Participants in both treatment arms will take the same number of pills on the same schedule. Study medication will be dispensed on a weekly basis starting with the baseline visit. Quetiapine will be titrated over a three-week period to the target dose of 300 mg or the maximum tolerated dose. The research psychiatrist will make dose reductions for tolerability if necessary.

Inclusion criteria

• Meets DSM-IV-TR criteria for current marijuana dependence
• Reports using marijuana an average of 5 days per week over the past 28 days
• Between the ages of 18 and 60
• Able to provide informed consent and comply with study procedures
• Seeking treatment for cannabis dependence

Exclusion criteria

• Lifetime DSM-IV diagnosis of schizophrenia, schizoaffective disorder, or bipolar disorder.
• Current DSM-IV criteria for any other psychiatric disorder that may, according to investigator's judgment, require either pharmacological or non-pharmacological intervention over the course of the study.
• Patients prescribed psychotropic medications.
• History of allergic reaction, intolerance, or hypersensitivity to Quetiapine.
• Pregnancy, lactation, or failure to use adequate contraceptive methods in female patients who are currently engaging in sexual activity with men.
• Unstable medical conditions, such as poorly controlled hypertension which might make participation hazardous.
• Diabetes (whether controlled or not), meeting criteria for metabolic syndrome as defined by the NCEP (any 3 of the following: a. obesity [waist circumference > 40 inches], b. hyperglycemia [fasting glucose > 100 mg/dl or Rx], c. dyslipidemia [TG > 150 mg/dl or Rx], d. dyslipidemia [HDL cholesterol; 40 mg/dl (male), 50 mg/dl (female) or Rx], e. hypertension [130 mmHg systolic or > 85 mmHg diastolic or Rx]. Participants with a BMI > 35 will be excluded.
• Current DSM-IV diagnosis of an alcohol or substance use disorder (abuse or dependence) other than marijuana or nicotine dependence.
• Positive confirmed result on urine toxicology screen.
• Are legally mandated to participate in a substance use disorder treatment program.
• Increased risk for suicide.
• QTc prolongation (screening electrocardiogram with Qtc > 450 msec for men, QTc > 470 msec for women) or history of QTc prolongation or using concomitant medications which prolong QTc interval.