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 headache, nausea, confusion, irregular or fast heartbeat, fainting, and loss of consciousness.

NOTES: Do not take this medication for several days before allergy testing since test results can be affected. Do not share this drug with others.

MISSED DOSE: If you are on a regular dosing schedule, take the missed dose as soon as possible but not if it is almost time for the next dose. If it is time for the next dose, skip the missed dose and resume your regular schedule. Do not "double-up" the dose.

STORAGE: Store at room temperature and keep away from moisture and sunlight. Do not store in the bathroom.

MEDICAL ALERT: Your condition can cause complications in a medical emergency. For enrollment information call MedicAlert at 1-800-854-1166 (USA), or 1-800-668-1507 (Canada).

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.