What is the onset of action for activated charcoal?

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Multiple Choice

What is the onset of action for activated charcoal?

Explanation:
Activated charcoal acts locally in the gastrointestinal tract by adsorbing toxins as soon as it comes into contact with them. Because this is a physical binding process in the lumen and not a systemic pharmacologic action, the onset is essentially immediate once administered. Timelines like within 30 minutes or within 2 hours imply a delay that isn’t part of the mechanism, and a delayed onset would not fit the way charcoal reduces toxin absorption. For best effect, it should be given promptly after ingestion, before the toxin has been absorbed.

Activated charcoal acts locally in the gastrointestinal tract by adsorbing toxins as soon as it comes into contact with them. Because this is a physical binding process in the lumen and not a systemic pharmacologic action, the onset is essentially immediate once administered. Timelines like within 30 minutes or within 2 hours imply a delay that isn’t part of the mechanism, and a delayed onset would not fit the way charcoal reduces toxin absorption. For best effect, it should be given promptly after ingestion, before the toxin has been absorbed.

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