Quinidex Extentabs Oral

In Depth

Certain long-acting brands of quinidine may appear as a whole tablet in the stool. This is the empty shell left after the medicine has been absorbed by the body. It is harmless.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Quinidex Extentabs Oral Precautions

Before taking quinidine, tell your doctor or pharmacist if you are allergic to it; or to quinine; or if you have any other allergies.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have:

certain types of heart disease (e.g., incomplete or complete heart block without an artificial pacemaker, torsades-type irregular heartbeats, digitalis toxicity)
very low blood pressure
history of easy bruising/bleeding (thrombocytopenic purpura) with use of quinine or quinidine
severe muscle weakness (myasthenia gravis)

Before using this medication, tell your doctor or pharmacist your medical history, especially of:

kidney disease
liver disease
a certain blood disorder (G6PD deficiency)
asthma
current infection with fever

Quinidine may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can infrequently result in serious (rarely fatal) fast/irregular heartbeat and other symptoms (such as severe dizziness, fainting) that require immediate medical attention. The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may affect the heart rhythm (see also Drug Interactions section). Before using quinidine, tell your doctor or pharmacist if you have any of the following conditions:

certain heart problems (heart failure, slow heartbeat, QT prolongation in the EKG)
family history of certain heart problems (QT prolongation in the EKG, sudden cardiac death)

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