Smoking Cessation Clinical Trial
Official title:
A Randomized, Double-Blind 4-Week Study to Evaluate the Impact of AXS-05 on Smoking Behavior
This research study is designed with the purpose of evaluating a new drug, combination Dextromethorphan-Bupropion (AXS-05), for its effects on smoking behavior.
This study aims to investigate the potential efficacy of a combination of two FDA-approved agents, sustained release (SR) Bupropion (BUP) and immediate release (IR) Dextromethorphan (DXM), for the purpose of smoking cessation treatment. DXM, a widely used over-the-counter cough suppressant, is a nicotine receptor antagonist. In fact, studies by Duke's Center for Smoking Cessation (CSC) have shown that administration of DXM leads to a decrease in self-administration of nicotine in nicotine-dependent rats. DXM, however, has not been studied in humans. DXM, when taken alone, is not expected to be useful for treating nicotine dependence in humans given DXM rapidly metabolizes in humans via CYP2D6. As a result, therapeutic concentrations needed to bind to nicotine receptors are not obtained. Therapeutic concentrations of DXM are required, therefore, to allow DXM to bind to nicotine receptors and act as a nicotine antagonist. In order to attain therapeutic concentrations of DXM a metabolism inhibitor must be introduced. BUP is a well-known FDA approved smoking cessation medication that has been shown to inhibit the metabolism of DXM. When BUP is co-administered with DXM to healthy volunteers, a significant increase in DXM plasma levels is observed. Currently, Axsome Therapeutics Inc. (Axsome) is developing and testing an oral fixed-dose combination of IR DXM with SR BUP to achieve therapeutic concentrations of DXM. This investigational drug has been named AXS-05. Axsome has found AXS-05 to be generally safe and well-tolerated in three Phase 1 studies. The adverse event profile of AXS-05 was similar to that of BUP alone. Given the distinct mechanisms by which BUP and DXM interact, it is hoped that combining DXM and BUP will prove more efficacious than either drug administered alone for the purpose of tobacco use treatment in humans. ;
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