What is the adult dose of activated charcoal?

• A. 1-2 g/kg
• B. 0.5-1 g/kg
• C. 3-4 g/kg
• D. 5-6 g/kg

Answer: (A)

Activated charcoal works by adsorbing many toxins in the gastrointestinal tract, preventing their absorption into the bloodstream. The dose is tailored to body size so there’s enough surface area to bind the toxin effectively. For adults, the dosing range commonly used is about 1 to 2 grams per kilogram of body weight. This range aims to provide enough charcoal for effective adsorption in a typical adult, giving a substantial but safe amount without overdoing it. Doses lower than this may not bind enough toxin, reducing effectiveness, while doses much higher than this can increase the risk of vomiting, aspiration, or intestinal issues and are not routinely used. Administer as a slurry with water within about an hour of ingestion, and avoid giving charcoal if the ingestion involved caustic substances, hydrocarbons with aspiration risk, or if the patient cannot protect their airway.