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Verapamil Side Effect

verapamil side effect

Verapamil Overview

Verapamil is a prescription medication used to treat chest pain, an irregular heartbeat, and high blood pressure. The extended- and sustained-release forms are used to treat high blood pressure. Verapamil belongs to a group of drugs called calcium channel blockers, which work by relaxing the blood vessels, making it easier for the heart to pump blood.

Verapamil comes in an immediate release tablet form and is taken 3 to 4 times a day, with or without food. The extended-release tablet and capsule forms are usually taken once a day, with or without food. The sustained-release tablet form is usually taken once or twice a day with food.

This medication is available in an injectable form to be given directly into a vein (IV) by a healthcare professional.

Common side effects of verapamil include constipation, nausea, low blood pressure, and headache. This medication can also cause dizziness. Do not drive or operate heavy machinery until you know how verapamil affects you.

Who should NOT take this medication?

Do not use verapamil if you:

  • are allergic to verapamil or any ingredients of this medication
  • are suffering from severe congestive heart failure and/or severe left ventricular dysfunction unless it is due to a cause that is treatable by verapamil
  • have a very low heart rate
  • have certain types of abnormal heart rhythms, including atrial flutter or atrial fibrillation and an accessory bypass tract (e.g., Wolff-Parkinson-White, Lown-Ganong-Levine syndromes)
  • have severe low blood pressure
  • have second- or third-degree heart block or sick sinus syndrome
  • This medication should not be given to people who are in cardiogenic shock or those who are suffering from certain types of complicated heart attack.

Verapamil Warnings

This medicine controls high blood pressure, arrhythmia, and angina, but it does not cure these conditions. You should continue to take verapamil even if you feel well.

Before taking verapamil, tell your doctor if you have or have ever had:

  • Any condition that causes food to move through your digestive system more slowly
  • Myasthenia gravis (a condition that causes certain muscles to weaken)
  • Heart failure
  • Heart, liver, or kidney disease
  • Muscular dystrophy (an inherited disease that causes weakening of the muscles).
  • You should also tell your doctor you are taking verapamil before any type of surgery, including dental procedures.

Your doctor will likely start you on a low dose of verapamil and then gradually increase your dose.

Verapamil Side Effects

Common Side Effects of Verapamil

You should tell your doctor if any of the following side effects are severe or do not go away:

  • Heartburn
  • Constipation
  • Headache
  • Dizziness or lightheadedness

Serious Side Effects

Verapamil may cause serious side effects. You should call your doctor immediately if you experience any of the following:

  • Difficulty swallowing or breathing
  • Swelling in the hands, feet, ankles, or lower legs
  • Fainting
  • Blurred vision
  • Slow heartbeat
  • Rash
  • Extreme fatigue
  • Nausea
  • Unusual bleeding or bruising
  • Lack of energy
  • Loss of appetite
  • Pain in the upper right part of the stomach
  • Flu-like symptoms
  • Yellowing of the skin or eyes (jaundice)
  • Fever

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