Clomid (clomiphene) is sometimes prescribed for the treatment of infertility and works similarly to estrogen, causing the egg to develop in the ovaries. Long-term use of this medicine can increase the risk of breast cancer. You are not supposed to take Clomid for longer than recommended. In most cases, six cycles are enough for a woman to conceive a child and the treatment is discontinued. Make sure you talk to your health care provider if you are planning to take any prescription or over-the-counter medications that have been reported to cause interactions with Clomid and may therefore affect the success of your treatment. Tell your doctor if you gain weight, get stomach or lower stomach pain, blurred vision, visual spots or flashes, stomach swelling, shortness of breath, or double vision, as those are serious side effects of taking Clomid. Less serious side effects include but are not limited to abnormal uterine bleeding, breast discomfort, vomiting, breast tenderness, headache, diarrhea, nausea, flushing, and blurred vision. There is no need to report them unless they change in intensity and start to bother you preventing from taking part in your everyday activities.