--A. Naltrexone, acamprosate, alcohol dehydrogenase inhibitors, topiramate, gabapentin, ondansetron, benzodiazepines, beta-blockers, H2-blockers, and alpha-1 blockers, baclofen, drugs that are known to prolong the QTc interval and barbiturates as well as hormone replacement therapy; medications and dietary/herbal supplements (like St. John's wort) that interact with Cytochrome P450 3A4. Patients who take these medications may be enrolled in the study only if the potentially interacting medication has been stopped for a period of at least 5 half-lives of the interacting medication before PF-05190457 administration.