Varenicline for smoking cessation: A placebo-controlled, randomized study
Version of Record online: 20 FEB 2009
© 2009 The Authors. Journal compilation © 2009 Asian Pacific Society of Respirology
Volume 14, Issue 3, pages 384–392, April 2009
How to Cite
WANG, C., XIAO, D., CHAN, K. P. W., POTHIRAT, C., GARZA, D. and DAVIES, S. (2009), Varenicline for smoking cessation: A placebo-controlled, randomized study. Respirology, 14: 384–392. doi: 10.1111/j.1440-1843.2008.01476.x
Conflict of interest: Pfizer Inc. funded the study and was involved with its design, analysis and writing the manuscript. All authors had complete access to all relevant data. Dahlia Garza and Simon Davies are employees of Pfizer Inc., and therefore hold shares in the company. Editorial support was provided by Aideen Young, PhD, of UBC Scientific Solutions and funded by Pfizer Inc. None of the other authors hold shares in any companies. Chen Wang and Dan Xiao are affiliated with the WHO Collaborating Centre for Tobacco or Health. WHO had no role in the study's funding, design, analysis or write-up.
- Issue online: 29 MAR 2009
- Version of Record online: 20 FEB 2009
- Received 8 May 2008; invited to revise 13 June 2008, 8 September 2008; revised 15 August 2008, 17 September 2008; accepted 18 September 2008 (Associate Editor: Ian Yang).
- smoking cessation;
Background and objective: Varenicline tartrate, a novel, selective, nicotinic acetylcholine receptor partial agonist, has been developed specifically as a smoking cessation drug. This study evaluated the efficacy of a standard regimen of varenicline compared with placebo for smoking cessation in 333 subjects in China, Singapore and Thailand.
Methods: This 24-week, randomized, double-blind, placebo-controlled trial of varenicline, 1 mg bd, consisted of a 12-week treatment period followed by a 12-week non-treatment follow-up period. The primary study end-point was the 4-week continuous abstinence rate defined as the proportion of subjects who reported total abstinence from smoking and other nicotine products from weeks 9–12. A key secondary end-point was the continuous abstinence rate from weeks 9–24, defined as the proportion of subjects who achieved the primary end-point as well as total abstinence from all tobacco products from weeks 13–24.
Results: Both end-points were achieved by a significantly higher proportion of subjects in the varenicline group than in the placebo group. The 4-week continuous abstinence end-point was achieved by 50.3% and 31.6% in the varenicline and placebo groups, respectively (P = 0.0003), while continuous abstinence from weeks 9–24 was achieved by 38.2% and 25.0% of subjects, respectively (P = 0.0080). The treatment effect was generalizable by treatment centre and country. Varenicline was safe and appeared to be well tolerated by most subjects.
Conclusion: Varenicline was significantly more efficacious for smoking cessation than placebo over a 12-week treatment period and a further 12-week non-treatment follow-up period in smokers from China, Singapore and Thailand. No significant side-effects were noted.