DRUG INTERACTIONS: Tell your doctor of all prescription and nonprescription drugs you may use, especially of: lithium, diazoxide, cholestyramine, colestipol, drugs used to treat diabetes, beta-blockers (e.g., atenolol, propranolol), verapamil. 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 drowsiness and lightheadedness.

NOTES: It is important to have your blood pressure checked regularly while taking this medication. Learn how to take your blood pressure. Discuss this with your doctor or pharmacist.

MISSED DOSE: If you miss a dose, take as soon as remembered; do not take if it is almost time for the next dose, instead, skip the missed dose and resume your usual dosing schedule. Do not "double-up" the dose to catch up.

STORAGE: Store at room temperature away from sunlight and moisture.

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.