Lil, I just read that the SSRI's can cause bone loss, and that it's recommended to get a baseline bone density scan if you plan to be on them for a length of time.
You are right...the doctors recommend staying on an AD for a yr or more to prevent relapse, but somehow I can only last about 6 months. I was really excited about the Effexor ( a SNRI)...it seemed to help me as well as the SSRIs without the sexual side effects...alas, I started having O trouble with this one too.