I am a long time heroin addict (F, 30) and I finally got the shot because I just couldn't stay clean otherwise. Usually when I go off the dope my libido ramps up drastically, which is good as it is the only thing that makes me feel as good as dope does, although totally different obviously! Now I am done with the precipitated withdrawal from the shot, which I got 4 days ago, but I have no sex drive. Is this a common side effect of vivitrol? I couldn't find anything about it.