Verapamil

Verapamil is used for treating supraventricular tachycardia, a rhythm disturbance of the heart. It is also used for controlling heart rate response to other rhythm disturbances, specifically atrial fibrillation and atrial flutter. It may also be used for other conditions as determined by your doctor.

Use Verapamil as directed by your doctor. Check the label on the medicine for exact dosing instructions.

Verapamil is usually given as an injection at your doctor's office, hospital, or clinic. If you will be using Verapamil at home, a health care provider will teach you how to use it. Be sure you understand how to use Verapamil. Follow the procedures you are taught when you use a dose. Contact your health care provider if you have any questions.

Do not use Verapamil if it contains particles, is cloudy or discolored, or if the vial is cracked or damaged.

Keep this product, as well as syringes and needles, out of the reach of children and pets. Do not reuse needles, syringes, or other materials. Ask your health care provider how to dispose of these materials after use. Follow all local rules for disposal.

If you miss a dose of Verapamil , take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Ask your health care provider any questions you may have about how to use Verapamil.

Verapamil is a calcium channel blocker. It works by slowing the electrical conduction in the heart, slowing heart rate, and/or normalizing heart rhythm.

Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and take the medicine at the next regularly scheduled time. Do not take extra medicine to make up the missed dose.

Store this medicine at room temperature in a tightly-closed container, away from heat and light.

Do NOT use Verapamil if:

• you are allergic to any ingredient in Verapamil
• you have certain heart problems (eg, left ventricular dysfunction, sick sinus syndrome, second- or third-degree heart block and do not have a pacemaker); very low blood pressure; or moderate to severe congestive heart failure (CHF)
• you have atrial fibrillation or flutter and a pre-excitation syndromes (extra conduction pathway in the heart), such as Wolff-Parkinson-White syndrome (WPW) or Lown-Ganong-Levine syndrome (LGL)
• you have shock due to serious heart problems
• you are taking dofetilide

• if you are pregnant, planning to become pregnant, or are breast-feeding
• if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
• if you have allergies to medicines, foods, or other substances
• if you have heart failure or a recent heart attack with lung congestion; low blood pressure; heart problems (eg, a very slow heart rate, heart block, heart valve disease)
• if you have kidney or liver problems, muscular dystrophy, or a neuromuscular disease
• if you are taking another blood pressure medicine

• Beta-blockers (eg, propranolol), disopyramide, ketolides (eg, telithromycin), or macrolides (eg, erythromycin) because the actions and the risk of side effects of Verapamil, some potentially life-threatening, may be increased
• Phenobarbital, rifampin, or St. John's wort because they may decrease Verapamil 's effectiveness
• Aldosterone blockers (eg, eplerenone), beta-blockers (eg, propranolol), other blood pressure medicines, carbamazepine, colchicine, cyclosporine, digitoxin, digoxin, dofetilide, dronedarone, eletriptan, erythromycin, everolimus, flecainide, HMG-CoA reductase inhibitors (eg, lovastatin, simvastatin), lithium, narcotic pain relievers (eg, fentanyl), nondepolarizing muscle relaxants (eg, atracurium), quinazolines (eg, metolazone), quinidine, ranolazine, theophyllines, or tolvaptan because the actions and the risk of side effects, some potentially life-threatening, may be increased by Verapamil

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Dizziness; fatigue; headache; lightheadedness.

Seek medical attention right away if any of these SEVERE side effects occur:
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); chest pain; lightheadedness, especially when standing; severe dizziness; shortness of breath; swelling of the feet or hands; unusually fast, slow or irregular heartbeat.

If you have any questions about Verapamil, please talk with your doctor, pharmacist, or other health care provider.
Verapamil is to be used only by the patient for whom it is prescribed. Do not share it with other people.
If your symptoms do not improve or if they become worse, check with your doctor.