Can last : Depends what is causing the food poisoning, as to how long the toxin takes to build up in the system, or cause projectile vomiting. Often it's less than 12 hours. After calling poison control center for instructions, depending on the type of food eaten, follow with hydration, and don't reintroduce solid food until the food poisoning is over. Start with a very bland diet, mainly liquids.
Answered 9/28/2016
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