Dianicline, a novel α4β2 nicotinic acetylcholine receptor partial agonist, for smoking cessation: A randomized placebo-controlled clinical trial

Introduction: Dianicline is a α4β2 nicotinic acetylcholine receptor partial agonist, a class of drugs that includes varenicline and cytisine. Varenicline is efficacious for smoking cessation, while cytisine has not been studied systematically. The efficacy of dianicline has not been previously tested in an adequately powered study. Methods: In a randomized, double-blind, parallel group placebo-controlled trial, 602 generally healthy cigarette smokers were assigned to dianicline (n = 300) or placebo (n = 302) for 7 weeks followed by a 19-week off drug follow-up period. Results: Exhaled carbon monoxide and cotinine-confirmed continuous abstinence rates for Weeks 4-7 were 24.0% for dianicline versus 20.5% for placebo (odds ratio 1.22; 95% CI, 0.83-1.80; p = .307). For Weeks 4-26, the abstinence rates were 16.7% for dianicline versus 13.9% for placebo (odds ratio 1.24; 95% CI, 0.79-1.93; p = .366). Craving for a cigarettes was reduced by dianicline compared with placebo after 7 weeks (p = .0175). Nicotine withdrawal symptoms measured by the Hughes and Hatsukami Minnesota Withdrawal Scale were lower for dianicline compared with placebo in the first 3 weeks of treatment during which time quit rates were also higher in the dianicline-treated group. Conclusions: Dianicline did not increase cigarette smoking abstinence rates beyond the initial phase of treatment. However, self-reported craving and nicotine withdrawal symptoms were reduced. © The Author 2010. Published by Oxford University Press on behalf of the Society for Research on Nicotine and Tobacco. All rights reserved.