DRUG INTERACTIONS: Tell your doctor of all prescription and nonprescription medication you may use, especially of: all antibiotics, barbiturates (e.g., phenobarbital, primidone), carbamazepine, ethosuximide, phenytoin, rifamycins (e.g., rifampin), pain medication, antihistamines (e.g., diphenhydramine), migraine medication (e.g., sumatriptan), griseofulvin, isoniazid, ascorbic acid (vitamin C), nitrofurantoin, high blood pressure drugs, beta-blockers (e.g., propranolol), corticosteroids (e.g., prednisone), diabetes medications, "blood thinners" (e.g., warfarin), psychiatric medications, theophylline, certain anti-anxiety drugs (e.g., diazepam), phenylbutazone. Cigarette smoking increases the risk of serious side effects. Tell your doctor if you smoke or if you have recently stopped smoking. Do not smoke while using this medication. Oral birth control pills should not be taken while using this product, since this medication can act as a birth control pill. Also, side effects may be increased if you take this with birth control pills. Ask your doctor or pharmacist for details. This drug may interfere with certain laboratory tests (such as LH and FSH levels). Do not start or stop any medicine without doctor or pharmacist approval.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly. Symptoms of overdose may include nausea and vomiting. Females may experience vaginal bleeding.

Report Problems to the Food and Drug Administration You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.