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Methadone could cause bigeminy, bradycardia, cardiac arrest, cardiac arrhythmia, cardiac failure, cardiomyopathy, ECG changes, edema, extrasystoles, flushing, hypotension, inversion T wave on ECG, orthostatic hypotension, palpitations, peripheral vasodilation, phlebitis, prolonged Q-T interval on ECG, shock, syncope, tachycardia, torsades de pointes, ventricular fibrillation, ventricular tachycardia, pulmonary edema, respiratory arrest, respiratory depression as the side effects. However they don't cause chest pain. The cause could not be due to methadone. He should be evaluated by his primary care doctor.