But there are also women who take Clomid without ever having any unpleasant side effects, and in any case you are probably not going to experience every side effect in the book. Let's take a look at some of the more common side effects that women who use Clomid can encounter. Nausea, hot flashes, tender breasts and mood swings on Clomid are the most common side effects. As far as fertility drugs go, the side effects are pretty mild actually. It might be best to go into taking Clomid with an open mind. Thinking you are not going to have any side effects is unrealistic, but being sure you will have them can be equally unrealistic. Two things are for sure, though. First, any side effects you get will go away as soon as you come off Clomid. Secondly, around 80 percent of women will have ovulation successfully stimulated on Clomid, almost half of them will get pregnant within six months. Those are without a doubt some very encouraging figures!