Yes it is. Here are the side effects of clomid:
Twin pregnancies may occur in as many as 5% of the women who use Clomid. Triplet pregnancies are far more rare. Other reported adverse effects include ovarian enlargement 13.6%,Vasomotor Flushes 10.4%, abdominal or pelvic discomfort, distention or bloating 5.5%, nausea and vomiting 2.2%, breast discomfort 2.1%, visual symptoms (blurred vision, lights, floaters, waves, unspecified visual complaints, photophobia, diplopia, scotoma, etc.) 1.5%, headache 1.3% and abnormal uterine bleeding (intermenstrual spotting, menorrhagia)1.3%. Although there has been much talk about the relationship of clomiphene (and other fertility drugs) to ovarian cancer the vast majority of the evidence now seems to point at infertility itself, rather than the use of fertility drugs as being the primary explanation for the slightly increased incidence of reproductive cancers in the infertility population.
Good luck and best wishes.