did your doc prescribe the wellbutrin? 300 is a high starting dose, like others said. if you need it though, suffering depression etc, i wouldn't give up on it yet just start at lower dose. it is a good antidepressent for many people, sexual sides are pretty rare for it but the increase in norepi can be pronounced for some people and actually exacerbate anxiety or cause palpitations among other things. i would try that though over an SSRI for depression any day... if anxiety tho, not best choice