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It is important to consult with your doctor or pharmacist about the risks and benefits of using this medication to treat an irregular heartbeat. This medication is intended for use in carefully chosen patients. While heart medications such as quinidine (antiarrhythmics) are typically effective, they may occasionally lead to new, severe, and potentially life-threatening irregular heartbeats.

Please consider the following precautions and information:

• Potential Risks: The medication can sometimes cause additional serious heart rhythm issues.
• Precautions for Use: Ensure this medication is suitable by discussing with a healthcare provider.
• Specific Populations: Patients with pre-existing heart conditions should be closely monitored.
• Interactions: Be cautious of interactions with other heart medications.
• Emergency Actions: In the event of an overdose or severe reaction, seek immediate medical attention.

Always follow your healthcare provider's guidance on the use of this medication.

You may experience mild side effects such as diarrhea, nausea, vomiting, loss of appetite, stomach pain or cramps, and a burning sensation in the throat or chest, similar to heartburn. These effects are usually manageable, but if they persist or worsen, it’s important to consult a healthcare professional.

Serious side effects, while less common, require immediate attention. These include vision changes, eye or muscle pain, signs of low blood sugar like unusual sweating or shakiness, signs of infection such as a persistent sore throat, fever, or chills, easy bruising or bleeding, extreme tiredness, and symptoms of liver problems such as persistent nausea or vomiting, dark urine, or yellowing of the eyes or skin. Additionally, aching or swollen joints should be reported promptly.

Seek urgent medical care if you experience very serious effects like severe dizziness, fainting, or sudden changes in heartbeat. Although rare, an allergic reaction can occur, characterized by rash, itching or swelling particularly of the face, tongue, or throat, severe dizziness, or difficulty breathing.

A specific reaction known as cinchonism may occur even with a single dose. Symptoms include ringing in the ears, sudden hearing issues, headache, blurred vision, or confusion, and should be reported to adjust your dosage if necessary. Note that certain long-acting quinidine tablets may appear intact in the stool; this is harmless as it's just the empty shell post-absorption. If you notice any side effects not listed, contact a healthcare provider for guidance.