DRUG INTERACTIONS: Tell the doctor of all nonprescription and prescription medication the patient may use, especially of: drugs that improve sexual function (e.g., sildenafil), blood pressure medications or heart medications (e.g., beta-blockers such as propranolol or metoprolol, calcium channel blockers such as diltiazem or verapamil, ganglionic-blocking drugs such as mecamylamine), anesthesia. 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.

NOTES: Laboratory and/or medical tests may be performed to monitor for side effects and response to treatment.

MISSED DOSE: If the dose is interrupted, contact the doctor immediately to re-establish dosing.

STORAGE: Store vials at room temperature between 59 and 86 degrees F (15 - 30 degrees C) away from light and moisture. Store vials in the carton until they are used. After mixing and dilution in IV fluids and when protected from light (consult the pharmacist for details), the drug is stable at room temperature for 24 hours. Discard any unused liquid.

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.