Side effects of ovulation stimulating drugs: abnormal increase in ovulation, ovarian hyperstimulation syndrome, improvement of hormone levels in the body. Ovulation promoting drugs are mainly hormonal drugs, which are mainly used for ovulation disorders caused by abnormal hormone secretion or relative lack of hormones in the body. The side effects of ovulation stimulating drugs are as follows: 1. Ovulation stimulating drugs will cause abnormal increase in ovulation in fertile women, which will lead to women carrying multiple babies, increase the chance of fetal malformation or birth defects, and cause complications such as premature rupture of membranes in mothers, high blood pressure, anemia and postpartum hemorrhage. 2. Ovarian hyperstimulation syndrome is due to massive ovulation in a short period of time and excessive secretion of hormones by the ovaries, which leads to increased permeability of blood vessels all over the body, and water will then seep out of the blood vessels, resulting in vascular embolism, which is life-threatening. 3. Ovulation promoting drugs will improve the hormone level in the body, which will lead to breast swelling and pain, dizziness, weakness and blurred vision. Therefore, when taking ovulation promotion drugs, they must be used under the guidance of a doctor. If there are several adverse reactions during ovulation promotion, you need to consult a doctor in a timely manner, and under the guidance of the physician targeted treatment, if necessary, need to stop the drug.