Oddly enough, in all my years of clinical practice, I've never had somebody who's bipolar tell me that they didn't need their meds - I've heard a lot of complaints about side effects and cost, and people not taking them for those reasons, but not that they didn't need them (unless they were manic).
You know who says that they don't need their meds, and that they're cured? Diabetics who've had bariatric surgery. And they're usually "sane."