I was never on it and never had labs done for prolactin. But because of meds I haven't had a period in over two years. I went to two Gyno's and they checked my other hormones and they were fine. I'm now on birth control just to have a period. Not like I missed it but I just felt it wasn't healthy to go two years and in my 20s without a period. As a matter of fact, now that I'm off risperdal I'm going to ask my pdoc next week for labs again. I thought I was the only one going through this.