Clinical Study of Generic and Brand Bupropion in Depression

"Subjects will be studied in 4 phases for a total of approximately 28 weeks:~Phase 1: an approximately 4-week lead-in phase during which participants remain on their existing bupropion product Phases 2 - 4: randomized cross-over phases of approximately 6 weeks on each of the four bupropion study drugs (brand and 3 generics)."