Final answer:
Activated charcoal should be used as soon as possible after the ingestion of poison, but its effectiveness may depend on the type of poison.
Step-by-step explanation:
The time frame for using activated charcoal after the ingestion of poison can vary depending on the type of poison and the specific situation. In general, activated charcoal is most effective when given as soon as possible after ingestion. It works by binding to the poison in the gastrointestinal tract, preventing its absorption into the bloodstream.
However, it is important to note that activated charcoal may not be effective for all types of poisons. For example, it may not be effective for poisoning caused by corrosive substances such as acids or alkalis.
It is always recommended to seek immediate medical attention in cases of poisoning, and to follow the advice of healthcare professionals regarding the use of activated charcoal.