Before you buy Clomid online read about its side effects that include possible enlargement of fibroid tumors if they are present during treatment, ovarian enlargement, vasomotor flushes, distention and bloating of the stomach, nausea and vomiting, blurred vision, abnormal bleeding or spotting, menorrhagia, acne, allergic reactions, retinal hemorrhage or retinal thrombosis, retinal spasm, temporary loss of vision, migraine headache, seizures, fever, tinnitus, and weakness throughout the body. Ovarian hyperstimulation syndrome is another serious side effect requiring special attention from your local doctor. Signs of OHSS include gross enlargement of the ovaries, acute gastrointestinal problems, hypotension, renal failure, pulmonary edema and acute respiratory distress. The early warning signs of OHSS are vomiting, diarrhea and nausea. OHSS can lead to serious complications including death, if not immediately treated. Call your local fertility doctor at the first sign of these side effects.