evidence: Principles for treating acute pesticide poisonings [...] - First aid for some swallowed pesticides includes giving activated charcoal after vomiting. This material adsorbs many chemicals and is available without a prescription. It is a powder mixed with water and given to the victim to drink. It should not be given at the same time as syrup of ipecac; the charcoal adsorbs the syrup, thus negating the beneficial effects of the syrup.