Which antidote is specifically indicated for iron toxicity?

• A. N-acetylcysteine
• B. Deferoxamine
• C. Librium
• D. Leucovorin

Answer: (B)

Deferoxamine is specifically indicated for iron toxicity because it is a chelating agent that binds to free iron in the bloodstream, forming a complex that can be excreted by the kidneys. In cases of iron overload or iron poisoning, such as from ingesting too many iron supplements, deferoxamine helps to reduce iron levels in the body, mitigating the damaging effects iron can have on various organs, particularly the liver and heart.

When iron is present in excess, it can catalyze harmful free radical reactions and lead to oxidative stress, resulting in cellular damage. Deferoxamine works by sequestering the excess iron, thereby preventing these toxic effects and allowing for safer excretion.

The other options listed serve different purposes and are not effective antidotes for iron toxicity. N-acetylcysteine is used for acetaminophen overdose, Librium is a benzodiazepine for anxiety and alcohol withdrawal, and Leucovorin is used in cases of folate deficiency or to mitigate the effects of methotrexate, but none address iron toxicity.