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 = Prescription Required
 = Generic Equvalent
Quinidine Acid Sulfate
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Biquin Durules
250MG Tablets (Sustained-Release)
Quinidine Acid Sulfate
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Quinidine Acid Sulfate Information
Quinidine (By mouth)
Quinidine (KWIN-i-deen)
Treats various types of irregular heartbeats (arrhythmias). Belongs to a class of drugs called antiarrhythmics.
Brand Name(s):Quinidex Extentabs
There may be other brand names for Quinidine Acid Sulfate. When Quinidine Acid Sulfate Should Not Be Used:
You should not use Quinidine Acid Sulfate if you have ever had an allergic reaction to quinidine or quinine. You should not take Quinidine Acid Sulfate if you have lupus or myasthenia gravis (a muscle disease). How to Use Quinidine Acid Sulfate:
Tablet, Capsule, Long Acting Tablet
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Your doctor will tell you how much to take and how often.
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Take Quinidine Acid Sulfate exactly as your doctor ordered, even if you feel fine.
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Take on an empty stomach - 1 hour before or 2 hours after meals. Your doctor may tell you to take Quinidine Acid Sulfate with food or milk to avoid stomach upset.
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Swallow the extended-release tablet whole - do not break, chew, or crush.
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You may need to carry identification so others will know that you are taking quinidine. Ask you doctor about this.
If a dose is missed:
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Take the missed dose as soon as you can unless you are more than 2 hours late, or 4 hours if you are taking extended-release tablets.
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If you are more than 2 hours late (4 hours for the extended-release tablets), skip the missed dose and take the medicine at your usual time.
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You should not use two doses at the same time.
How to Store and Dispose of Quinidine Acid Sulfate:
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Store at room temperature, away from heat, moisture, and direct light.
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Keep all medicine out of the reach of children.
Drugs and Foods to Avoid:
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
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Make sure your doctor knows if you are taking other heart medicines such as Procan®, Lanoxin®, Cordarone®, or Inderal®, blood thinners such as Coumadin®, acetazolamide (Diamox®), or pimozide (Orap®).
Warnings While Using Quinidine Acid Sulfate:
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Check with your doctor before taking quinidine if you have blood, kidney or liver disease, asthma, an infection, psoriasis (a skin disease), or overactive thyroid.
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Tell your doctor or dentist that you are taking quinidine before you have any kind of surgery.
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Do not suddenly stop taking Quinidine Acid Sulfate without checking with your doctor.
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Talk with your doctor before taking quinidine if you are pregnant or breastfeeding.
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Quinidine may make you dizzy or drowsy. Be careful if you drive a car or operate machinery.
Possible Side Effects While Using Quinidine Acid Sulfate:
Call your doctor right away if you notice any of these side effects:
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Chest pain
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Shortness of breath or trouble breathing
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Blurred vision or ringing in the ears
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Fever
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Skin rash, severe itching or hives
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Unusual bruising or bleeding
If you notice these less serious side effects, talk with your doctor:
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Dizziness, lightheadedness, fainting
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Bitter taste
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Headache or confusion
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Nausea or vomiting
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Diarrhea, stomach cramps, or loss of appetite
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Tiredness or weakness
If you notice other side effects that you think are caused by Quinidine Acid Sulfate, tell your doctor.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088
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