Did you know that activated charcoal can interact with certain medications? According to experts, activated charcoal's ability to adsorb drug molecules in the gut can reduce their effectiveness. This effect is strongest when both the drug and charcoal are ingested within an hour of each other. People who use activated charcoal for purposes other than treating poisoning should be aware of this interaction and consult a healthcare provider if taking medications.

Source: https://www.livescience.com/health/medicine-drugs/does-activated-charcoal-interact-with-medication