What side effects may I notice from receiving Ganirelix?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-breathing problems
-nausea and vomiting along with severe stomach pain
-pelvic pain or bloating

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-headache
-hot flashes
-pain, redness, or irritation at site where injected
-mild nausea

This list may not describe all possible side effects for Ganirelix. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.