An oral suspension of activated charcoal (AC) should be considered in poisonings when gastrointestinal decontamination of a xenobiotic is indicated, and AC can be administered within 1 hour of ingestion. Careful consideration of the contraindications (click here) should occur prior to treatment with activated charcoal.  

Activated charcoal seemed to have the best risk:benefit ratio among gastric lavage, ipecacuanha, or supportive treatment if given within four hours of ingestion (Paracetamol over dose).  

Oral activated charcoal in the treatment of intoxications. Role of single and repeated doses.

Activated charcoal for acute overdose:


see more here https://www.ncbi.nlm.nih.gov/pubmed/?term=Oral+activated+charcoal


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