Yes! I'm getting bloodwork tomorrow to confirm but I haven't had my period since February and I also produce milk. I looked it up though and it doesn't seem to have serious long term effects, except I can't get pregnant, which is fine with me because I'm not even sexually active right now and I don't want another kid like, ever. The worst part is the incessant weight gain. Which only COULD be the prolactin. But Invega works so well for me I'm not willing to go off of it. It took me two years to find it and I haven't had a manic/mixed episode in the two years I've been on it. Doesn't do **** for depression but at least it takes care of one end of the pole.