Will diet pills affect the effectiveness of birth control ?

BCP effectiveness: No, if your take your birth control pills correctly, they should not affect the efficacy of the medication. I am referrring to diet pills that are prescribed by a physician who is knowlegeable and trained in the treatment of medical weight loss. A good web site to check is the asbp--american society of bariatric physicians.

Usually no: None of the typical diet pills, like over the counter ones (usually caffeine or other stimulant based) or prescription ones (like phentermine) do not affect birth control of any method.