Testing a Full Substitution Therapy Approach As Treatment of Tobacco Dependence

Testing a Full Substitution Therapy Approach As Treatment of Tobacco Dependence

This study will test a new medication strategy designed to help smokers quit. It will combine selegiline, a drug currently approved and available for the treatment of Parkinson's disease, with a nicotine skin patch. Forty nicotine-dependent smokers will enrolled in this study. Twenty will receive placebo (inactive pill) plus nicotine patch, and twenty will receive selegiline plus nicotine patch. Once enrolled in the study, subjects will visit the Nicotine Dependence Clinic at CAMH on a weekly basis for assessment of smoking behavior, a brief health check, collection of breath and urine samples (necessary to drug levels and nicotine levels), and receive brief individual counseling designed to help them stop smoking. The medication phase of this study lasts 9 weeks. A follow-up visit will be conducted six months after trial completion. At that point, health and behavioral measures will be re-assessed.

This pilot study utilizes a double-blind, two-armed design to evaluate the efficacy of combining oral selegiline with transdermal nicotine patch for smoking cessation in 40 nicotine-dependent smokers. After successful completion of 3 screening visits (to ensure medical and psychiatric eligibility criteria are met), subjects will be randomized into one of two experimental groups:

1. selegiline (10 mg/day) + NRT (21 mg/24 hr)
2. matching placebo + NRT (21 mg/24 hr)

Randomization will be performed through the use a random number list to generate 50% selegiline/50% placebo and also 50% male/50% female within each of those treatment groups.

Participants will begin selegiline (or placebo) once a day during Week 1, and dose will be graduated to full study dosage (10 mg/day) by adding an evening intake (a.m. and p.m. dosing) for Weeks 2-8. Day 15 of the trial represents target quit day and the transdermal nicotine patch (21 mg/24hr) will be applied at this time. Patches will be worn in conjunction with study medication for Weeks 3-8, after which the patch will be removed and study medication tapered throughout Week 9.

Subjects will present weekly to the Nicotine Dependence Clinic where they will provide breath, urine and blood samples as required, receive brief smoking cessation counseling and complete questionnaires regarding their smoking behavior and psychological state. A post-trial physical will be conducted upon completion of Week 9. Monthly follow-up phone interviews will be conducted for 5 months and subjects will be re-assessed in the NDC for a 6-month follow-up.

Trial Objectives

1. To determine if combination of selegiline hydrochloride and NRT (full substitution to tobacco) is superior to NRT alone + placebo (partial substitution) for smoking cessation in nicotine dependent smokers.

   • The primary hypothesis is that full substitution (selegiline + NRT) will be superior to placebo + NRT for achievement of 7-day point prevalence smoking abstinence rates at the end of trial abstinence rates (Day 49-56) assessment in nicotine-dependent cigarette smokers.
   • Secondary hypothesis 1a is that full substitution (selegiline + NRT) will be superior to NRT for achievement of last four weeks of trial (Days 29-56) smoking abstinence rates in nicotine-dependent cigarette smokers.
   • Secondary hypothesis 1b is that full substitution (selegiline + NRT) will be superior to NRT for achievement 6-month post target quit date smoking abstinence rates in nicotine-dependent cigarette smokers.

2. To determine if treatment retention and study medication compliance will be higher in the full substitution (selegiline + NRT) group as compared to the NRT group during the 8-week smoking cessation trial.

   Hypothesis 2 is that treatment retention and study medication compliance will be higher in the full substitution (selegiline + NRT) group as compared to the NRT group during the 8-week smoking cessation trial.

3. To determine if full substitution (selegiline + NRT) reduces nicotine craving and withdrawal symptoms as compared to NRT group during the 8-week smoking cessation trial.

   Hypothesis 3 is that full substitution treatment will lead to significant reductions in tobacco withdrawal and craving ratings compared to NRT group.

4. To determine adverse events profile in nicotine-dependent smokers of the combination of selegiline and NRT as compared to NRT.

Hypothesis 4 is that selegiline in combination with NRT will be well-tolerated and that rates of adverse events will not be significantly different between subjects assigned to full substitution as compared to NRT group.

Inclusion Criteria:

• Meet DSM-IV criteria for nicotine dependence with FTND score > 5.
• Smoke at least 15 cigarettes (3/4 pack) daily (averaged over 1 week, in the past 1 month).
• At the time of initial evaluation, are motivated to quit smoking in the next 30 days.
• Have made at least one unsuccessful attempt to quit smoking in the past year.
• At baseline, have expired breath CO level > 10.
• Are between ages 18-70 years old.
• Weigh at least 100 lbs (45.5 kg, selegiline dose < 0.22 mg/kg).
• No previous use of nicotine replacement products in the one month prior to randomization.
• Have the capacity to give informed consent, and are English-speaking.

Exclusion Criteria:

• Have present or past diagnoses of schizophrenia, bipolar disorder, PTSD, BPD or major depressive illness.
• Have abused alcohol or other drugs of abuse (cocaine, opiates, benzodiazepines, etc) in 6 months prior to randomization into the trial (based on clinical evaluation including self-report, and confirmed by positive urine).
• Demonstrate serious medical conditions (i.e. abnormal liver function [as evidenced by AST, ALT or bilirubin values 2x ULN], unstable cardiovascular disease, significant blood abnormalities).
• Exhibit or have history of clinical hypertension.
• Exhibit active peptic ulcer disease.
• Are pregnant, are trying to become pregnant, or are currently breastfeeding.
• Are on current medication regimes that include antidepressants, or sympathomimetic agents, or meperidine and other meperidine-opioids which may have interactions with selegiline.
• Known hypersensitivity to selegiline or NRT.
• Are from the same household as another study participant.