Amiodarone

Amiodarone is a potent antiarrhythmic drug used to treat life-threatening heart rhythm disorders. It works by blocking several types of electrical channels in heart muscle cells, which slows down nerve impulses and stabilizes the heart's rhythm. Due to its significant and potentially fatal toxicity, its use is reserved for situations where other treatments have failed or are not tolerated.

Verdict

A last-resort, life-saving drug for severe arrhythmias with major toxicity risks.

Protocol

• Oral loading doses of 800-1600 mg/day are given in a hospital setting for 1-3 weeks.
• Maintenance doses are typically reduced to the lowest effective dose, usually 200-400 mg/day.
• Intravenous administration is used for acute, life-threatening arrhythmias in a hospital setting.

Flags

• US FDA Black Box Warning for life-threatening arrhythmias, hepatotoxicity, and pulmonary toxicity.
• Can cause irreversible, potentially fatal pulmonary fibrosis.
• May cause severe liver injury requiring regular monitoring of liver function.
• Frequently causes thyroid dysfunction (both hyperthyroidism and hypothyroidism).
• Can cause corneal microdeposits and optic neuropathy, potentially leading to blindness.
• Has a very long half-life (weeks to months), so side effects can persist long after discontinuation.
• Numerous significant drug interactions, including with warfarin, digoxin, and certain statins.
• Causes photosensitivity, increasing the risk of severe sunburn.