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Amiodarone, a versatile Class III antiarrhythmic drug, is considered one of the most effective agents in counteracting supraventricular and ventricular tachyarrhythmia. Delirium related to amiodarone therapy is infrequently associated with amiodarone. Although the prevalence of this disorder is extremely low, it is worthy of note the time-dependent relationship between the onset of therapy and the beginning of psychiatric symptoms. We report the case of an older woman who was diagnosed with a case of decompensated dilated cardiomyopathy with atrial fibrillation. She developed delirium after treatment with amiodarone. It also highlights the use of antipsychotic, despite continuous use of amiodarone.