Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Anti arrythmia drugs have many side effects, most common side effects are nausea,dizziness, fatigue,rarely, they may cause ventricular arrhythmias — life-threatening rhythm disturbances originating in the heart s lower chambers. These medications may be needed indefinitely. Even with medications, there is a chance of another episode of atrial fibrillation. Other drugs which may be used for atrial fibrillation is dofetilide ,flecainide,propafenone ,amiodarone ,sotalol etc. Please consult your Cardiologist he will examine and treat you accordingly. Hope I have answered your query. Let me know if I can assist you further.