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According to the FDA, doctors should prescribe amiodarone only to patients with life-threatening heart rhythm disturbances that have not responded to other treatment.

For example, the heart rhythm drug amiodarone can block metabolism of the blood thinner warfarin, which results in very high warfarin concentrations that could lead to life-threatening bleeding.

Other causes include certain medications, such as chemotherapy and amiodarone, which can all lead to drug toxicity and PF.

They found he had an irregular heart rhythm called atrial fibrillation and put him on amiodarone.

This week: flu vaccine; side effects of melatonin; danger of using amiodarone.