Activated charcoal is indicated for which condition?

• A. Poisoning or overdoses
• B. Dehydration
• C. Headache
• D. Asthma

Answer: (A)

Activated charcoal works by binding many ingested toxins in the gastrointestinal tract, forming a nonabsorbable complex that reduces how much toxin enters the bloodstream. Because of that binding action, it’s used in poisonings or overdoses when the substance is one that charcoal can adsorb and the patient can be treated within a short window after ingestion—ideally promptly after the ingestion to maximize effect.

It’s not a treatment for dehydration, headache, or asthma. Dehydration is managed with fluids and electrolytes; headaches and asthma are treated with appropriate medications like analgesics and bronchodilators/steroids, not toxin binders.

Give activated charcoal only if the airway can be protected and there’s no high risk of aspiration. It’s avoided with caustic substances (strong acids or alkalis) and many hydrocarbons, where it can cause harm or provide little benefit. It’s also not reliably effective for heavy metals or alcohols.