In this study patients with paroxysmal or persistent atrial fibrillation will be considered for randomisation. Following the ablation procedure, patients will be randomized to receive either amiodarone or placebo for a period of 8 weeks. Clinical visits including a physical exam, 12 lead ECG recording and blood samples, will be scheduled during the follow-up time. Furthermore patients will be evaluated with Quality of Life questionaires and Holter monitoring.