Hello, I'm a healthcare professional with a background in pharmacology. I can provide you with information about the side effects of flecainide. Flecainide is an antiarrhythmic medication used to treat certain types of abnormal heart rhythms. While it can be effective in managing these conditions, it also comes with a range of potential side effects. It's important to note that not everyone will experience these side effects, and the severity can vary from person to person. Common side effects of flecainide may include: 1. Dizziness 2. Lightheadedness 3. Nausea 4. Vomiting 5. Diarrhea 6. Constipation 7. Fatigue 8. Difficulty sleeping (insomnia) 9. Headache Serious side effects that require immediate medical attention include: 1. Chest pain 2. Difficulty breathing 3. Weakness 4. Fainting 5. Irregular heartbeats or palpitations 6. Vision problems 7. Severe dizziness or spinning sensation Additionally, flecainide can cause or worsen heart failure, and it may increase the risk of developing a serious heart condition called torsades de pointes, which is a type of ventricular tachycardia. Patients taking flecainide should be closely monitored by a healthcare provider, especially during the initial stages of treatment, to ensure the drug is working as intended and to promptly identify any potential side effects. read more >>

Less serious side effects may include:dizziness;tremor or shaking;headache;anxiety or depression;vision problems;nausea, vomiting, stomach pain;diarrhea, constipation; or.numbness or tingling.read more >>