Not me. I'm on Seroquel, have been for awhile. Oh, and I took Abilify for ages, didn't lose it on that either, and I was on a variety of increasing dosages before the pdoc gave up on it.

Breastfeeding stopped my periods for 9 months (because of the high pro-lactin).

How old are you? Are you normal weight? Have you gained or lost weight rapidly or started dieting or exercising a lot? All those things can affect your cycle too. Do you take any type of hormonal birth control? Any chance of pregnancy? Were your cycles regular before the Haldol? Do you have kids? Having a child unfortunately shortened my cycle length by 5 days once it started up again after nursing, but for one of my sisters, her cycles were just crazy unpredictable after kids.