Which of the following is a precaution associated with activated charcoal use?

• A. Dairy products reduce absorption capacity
• B. It is used only in pregnancy category A
• C. It should be avoided with all liquids
• D. It has no interactions

Answer: (B)

Activated charcoal works by adsorption, trapping toxins in the GI tract to limit their absorption. A key precaution is that charcoal can also bind other substances you ingest—other medications, supplements, or even certain foods—reducing their absorption and effectiveness. Because of this interaction potential, it isn’t tied to a single pregnancy category or considered universally safe with all other oral agents; its use is guided by clinical context, timing, and the patient’s ability to protect their airway. In practice, this means you must avoid giving it if there’s a risk of aspiration, and be mindful that co‑administered medications may have diminished effect if given too closely to charcoal.