As a healthcare professional, I can provide you with information on the potential side effects of Multaq (dronedarone) 400 mg, which is a medication used to treat atrial fibrillation, an irregular heartbeat. **Side effects of Multaq 400 mg can include:** 1. Gastrointestinal issues: Some patients may experience nausea, vomiting, diarrhea, or abdominal pain. 2. Liver problems: There is a risk of elevated liver enzymes, which can indicate liver injury. Regular monitoring of liver function is recommended. 3. Skin reactions: Rash or itching can occur. 4. Respiratory issues: Cough or shortness of breath may be experienced. 5. Fatigue or weakness: Patients might feel tired or weak. 6. Vision changes: Some individuals have reported changes in vision. 7. Cardiac issues: There is a potential for QT prolongation, which can lead to a serious heart rhythm problem. 8. Allergic reactions: In rare cases, severe allergic reactions can occur. It's important to note that not all patients will experience these side effects, and they can vary in severity. If any side effects are severe or persistent, medical advice should be sought immediately. **read more >>

Call your doctor at once if you have:shortness of breath (even with mild exertion), swelling, rapid weight gain;chest pain, wheezing, trouble breathing, dry cough, or coughing up mucus;breathing problems while lying down trying to sleep;severe dizziness, fainting, fast or pounding heartbeats;More items...read more >>