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Important Note

The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. Consult your healthcare professional before using this drug.




This medication is used to control heart rate and rhythm (e.g., ventricular fibrillation) on a short-term basis.

How To Use

This medication is given either into a vein (IV) or into a muscle (IM), as directed by the doctor. When given into a muscle, the site of injection is changed with each injection to minimize side effects. This medication is generally given with the patient lying down in order to minimize side effects. Dosage is based on the patient's medical condition and response to the drug. Follow all directions for proper mixing and dilution with certain IV fluids. Consult the pharmacist. This medication should be checked visually for particles or discoloration before use. If present, do not use the liquid.

Side Effects

Dizziness, nausea, vomiting or pain/redness at the injection site may occur. If these effects persist or worsen, notify the doctor. Very unlikely but report promptly: slow or irregular heartbeat, fainting, headache, chest pain, change in amount of urine, rash, mental/mood changes, fever, sweating, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.


Tell the doctor the patient's medical history, including: any allergies, kidney disease, heart disease, blocked blood vessels (aortic stenosis), lung problems (pulmonary hypertension). To avoid dizziness and lightheadedness, the patient should remain lying down or, if necessary, get up slowly when rising from a seated or lying position. Caution is advised when using this drug in the elderly since they may be more sensitive to the effects of the drug. This medication should be used only when clearly needed during pregnancy. Discuss the risks and benefits with the doctor. It is not known whether this drug is excreted into breast milk. Consult the doctor before breast-feeding.

Drug Interactions

Tell the doctor of all nonprescription and prescription medication the patient uses, especially of: digoxin, catecholamines (e.g., dopamine or norepinephrine), other heart rhythm medications (e.g., quinidine, procainamide, propranolol). Do not start or stop any medicine without doctor or pharmacist approval.


If overdose is suspected, contact your local poison control center or emergency room immediately.


Do not share this medication with others. Laboratory and/or medical tests will be performed to monitor for side effects and response to treatment.

Missed Dose

Not applicable.


Store at room temperature between 59 and 86 degrees F (15 - 30 degrees C) away from light and moisture. Do not freeze. After mixing and dilution in IV fluids (consult the pharmacist for details), this medication is stable at room temperature for 48 hours or when refrigerated at 39 degrees F(4 degrees C) for 7 days. 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).