Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Some women using  urofollitropin develop a condition called ovarian hyperstimulation syndrome (OHSS), especially after the first treatment. OHSS can be a life threatening condition. Stop using urofollitropin, do not have sexual intercourse, and call your doctor right away if you have any of the following symptoms of OHSS:
stomach pain, bloating;
nausea, vomiting, diarrhea;
rapid weight gain, especially in your face and midsection;
little or no urinating; or
pain when you breathe, rapid heart rate, feeling short of breath (especially when lying down).
Also call your doctor at once if you have signs of a stroke or blood clot, such as:
sudden numbness or weakness (especially on one side of the body), sudden severe headache, slurred speech, problems with vision or balance;
chest pain, sudden cough, wheezing, rapid breathing, coughing up blood; or
pain, swelling, warmth, or redness in one or both legs.
Common side effects may include:
stomach cramps or bloating;
headache, general pain;
nausea;
trouble breathing;
hot flashes; or
mild pelvic pain, pain after an egg is removed for in-vitro fertilization.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Urofollitropin side effects (more detail)
