Generic name: Quinidine Controlled-Release Tablets (KWIN ih deen)
Drug class: Group I antiarrhythmics
Medically reviewed by Drugs.com. Last updated on Nov 4, 2020.
WarningFor treating an abnormal heartbeat:
- This medicine is only to be used to treat heartbeats that are not normal and that may be deadly. It may cause very bad and sometimes deadly side effects. Talk with the doctor.
Uses of Quinidine Controlled-Release Tablets:
- It is used to treat certain types of abnormal heartbeats.
What do I need to tell my doctor BEFORE I take Quinidine Controlled-Release Tablets?
- If you have an allergy to quinidine or any other part of this medicine (quinidine controlled-release tablets).
- If you are allergic to this medicine (quinidine controlled-release tablets); any part of this medicine (quinidine controlled-release tablets); or any other drugs, foods, or substances. Tell your doctor about the allergy and what signs you had.
- If you have heart problems.
- If you have myasthenia gravis.
- If you have ever had a low platelet count when using quinine or quinidine.
- If you are breast-feeding. Do not breast-feed while you take this medicine (quinidine controlled-release tablets).
This is not a list of all drugs or health problems that interact with this medicine (quinidine controlled-release tablets).
Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take this medicine (quinidine controlled-release tablets) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.
What are some things I need to know or do while I take Quinidine Controlled-Release Tablets?
- Tell all of your health care providers that you take this medicine (quinidine controlled-release tablets). This includes your doctors, nurses, pharmacists, and dentists.
- Have blood work checked as you have been told by the doctor. Talk with the doctor.
- Avoid grapefruit and grapefruit juice.
- If you are on a low-salt or salt-free diet, talk with your doctor.
- Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using this medicine (quinidine controlled-release tablets) while you are pregnant.
How is this medicine (Quinidine Controlled-Release Tablets) best taken?
Use this medicine (quinidine controlled-release tablets) as ordered by your doctor. Read all information given to you. Follow all instructions closely.
- Keep taking this medicine (quinidine controlled-release tablets) as you have been told by your doctor or other health care provider, even if you feel well.
- Swallow whole. Do not chew or crush.
- Some products may be broken in half. If you are not sure if you can break this product in half, talk with the doctor.
What do I do if I miss a dose?
- Take a missed dose as soon as you think about it.
- If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
- Do not take 2 doses at the same time or extra doses.
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Very bad dizziness or passing out.
- Slow heartbeat.
- Chest pain or pressure.
- Feeling very tired or weak.
- Ringing in ears.
- Hearing loss.
- Very upset stomach or throwing up.
- Mood changes.
- Change in balance.
- Change in eyesight.
- If bright lights bother your eyes.
- Feeling confused.
- Very bad headache.
- Fever or chills.
- A type of abnormal heartbeat (prolonged QT interval) has happened with this medicine (quinidine controlled-release tablets). Sometimes, this has led to another type of unsafe abnormal heartbeat (torsades de pointes). Call your doctor right away if you have a fast or abnormal heartbeat, or if you pass out.
- Low platelet counts have rarely happened with this medicine (quinidine controlled-release tablets). This may lead to a higher chance of bleeding. Call your doctor right away if you have any unexplained bruising or bleeding.
What are some other side effects of Quinidine Controlled-Release Tablets?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
- Belly pain.
- Feeling tired or weak.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at https://www.fda.gov/medwatch.
If OVERDOSE is suspected:
If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
How do I store and/or throw out Quinidine Controlled-Release Tablets?
- Store at room temperature.
- Protect from light.
- Store in a dry place. Do not store in a bathroom.
- Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
- Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.
Consumer information use
- If your symptoms or health problems do not get better or if they become worse, call your doctor.
- Do not share your drugs with others and do not take anyone else's drugs.
- Some drugs may have another patient information leaflet. Check with your pharmacist. If you have any questions about this medicine (quinidine controlled-release tablets), please talk with your doctor, nurse, pharmacist, or other health care provider.
- If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.
More about quinidine
- Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
- Drug Interactions
- Pricing & Coupons
- En Español
- 2 Reviews
- Drug class: group I antiarrhythmics
- Patient Information
- Quinidine Oral, Injection, Intramuscular (Advanced Reading)
- Quinidine Sulfate Tablets
- Quinidine Injection
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Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.