I was told to stop taking my daily betablocker (Coreg)before a myocardial perfusion test.  I was hospitalized with chest pain and a bout of atrial fibrillation.  I have cardiomyopathy and was prescribed amiodarone and warfarin, but I stopped taking them when I learned of their side effects.  Was it wrong to stop taking the Coreg?
D000319:Adrenergic beta-Antagonists / Q000009:adverse effects / Q000627:therapeutic use*; D000638:Amiodarone / Q000009:adverse effects / Q000627:therapeutic use*; D000925:Anticoagulants / Q000009:adverse effects / Q000627:therapeutic use*; D001281:Atrial Fibrillation; D009202:Cardiomyopathies / Q000503:physiopathology*; D002637:Chest Pain; D006801:Humans; D010477:Perfusion; D014665:Vasodilator Agents / Q000009:adverse effects / Q000627:therapeutic use*; D014859:Warfarin / Q000009:adverse effects / Q000627:therapeutic use*
D000319:Adrenergic beta-Antagonists; D000925:Anticoagulants; D014665:Vasodilator Agents; D014859:Warfarin; D000638:Amiodarone