Clomid (clomiphene) can be used by patients diagnosed with infertility (i.e. unable to conceive a child as their ovaries do not produce eggs). Side effects of Clomid are common, but since you are supposed to take this medicine for only five days, some of them can be easily tolerated as they go away when your cycle of treatment is stopped. The following side effects are sometimes reported by patients using Clomid: nausea, flushing, breast tenderness, blurred vision, breast discomfort, headache, vomiting, abnormal uterine bleeding, and diarrhea. More serious side effects include double vision, shortness of breath, weight gain, blurred vision, stomach swelling, stomach or lower stomach pain, and visual spots or flashes. They will need to be reported to your health care provider right away. Make sure you do not take any other medicines while using Clomid and use a reliable method of birth control. Clomid is FDA pregnancy category X - this drug has been reported to cause very serious birth defects in babies whose mothers took Clomid. You must stop the treatment right away if you think you may be pregnant and talk to you health care provider right away to learn about your options.