Quinidine is used to treat abnormal heart rhythms and malaria. Avoid drinking grapefruit juice while on quinidine.

Quinidine Overview


Quinidine is a prescription medication used to treat abnormal heart rhythms. It is also used to treat malaria. Quinidine belongs to a group of drugs called antiarrhythmics. These work by making your heart more resistant to abnormal activity. 

This medication comes in tablet form and is taken up to 3 times a day. This medication comes in extended release tablet form and is taken up to 3 times a day. Do not crush or chew quinidine tablets. Tablets can be broken in half. This medication is also available in an injectable form to be given directly into a vein (IV) by a healthcare professional. 

Common side effects of quinidine include diarrhea, lightheadedness, and headache. Quinidine can also cause dizziness. Do not drive or operate heavy machinery until you know how quinidine affects you. 

Quinidine Genetic Information

CYP2D6 is a protein in your body that is involved in the elimination of quinidine and other drugs from your body. Some patients have less of this protein in their bodies, affecting how much of the drug gets eliminated. Levels of CYP2D6 can vary greatly between individuals, and those having less of this protein are known as "poor metabolizers." 

CYP2D6 testing is done to determine whether you are a poor metabolizer. If you are a poor metabolizer, the levels of quinidine in your blood can become too high. As a result you may be at an increased risk of having more side effects from quinidine. 

Your doctor may adjust your dose of quinidine if you are a poor metabolizer.

How was your experience with Quinidine?

First, a little about yourself

Tell us about yourself in a few words?

What tips would you provide a friend before taking Quinidine?

What are you taking Quinidine for?

Choose one
  • Other
  • Arrhythmias, Cardiac
  • Atrial Fibrillation
  • Atrial Flutter
  • Malaria, Falciparum
  • Tachycardia, Supraventricular
  • Tachycardia, Ventricular

How long have you been taking it?

Choose one
  • Less than a week
  • A couple weeks
  • A month or so
  • A few months
  • A year or so
  • Two years or more

How well did Quinidine work for you?

Did you experience many side effects while taking this drug?

How likely would you be to recommend Quinidine to a friend?

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Uses of Quinidine

Quinidine is a prescription medication used to treat abnormal heart rhythms and malaria.

This medication may be prescribed for other uses. Ask your doctor or pharmacist for more information. 

Quinidine Brand Names

Quinidine may be found in some form under the following brand names:

Quinidine Drug Class

Quinidine is part of the drug class: