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DRUG INTERACTIONS: Tell your doctor of all prescription and nonprescription medication you may use, especially of: digoxin and other heart (antiarrhythmic), blood pressure drugs such as beta- blockers (e.g., propranolol, timolol ), other calcium channel blockers (e.g., nifedipine, verapamil), intravenous (IV) calcium, nitrates (e.g., sublingual nitroglycerin), disopyramide, flecainide, quinidine, cimetidine, cyclosporine, carbamazepine, theophylline, lithium, benzodiazepines (e.g., midazolam, triazolam), buspirone, lovastatin, rifampin, St John's wort. 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 dizziness, weakness, slowed or irregular heartbeat, nausea, drowsiness, confusion, and slurred speech.

NOTES: Do not share this medication with others. Laboratory and/or medical tests will be performed to monitor your progress (e.g., blood pressure and EKG).

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

STORAGE: Store the vials in the refrigerator between 36 and 46 degrees F (2-8 degrees C) away from light and moisture. Do not freeze. The vials may be stored at room temperature for 1 month. The single dose syringes (Lyo-ject) should be stored at room temperature between 59 and 86 degrees F (15-30 degrees C). Once the powder has been mixed with the solution, the syringe can be stored at room temperature for 24 hours. Discard any unused solution after 24 hours. If the drug is added to a larger volume of solution, it can be stored at room temperature or under refrigeration (36-46 degrees F or 2-8 degrees C) and should be used within 24 hours.

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.