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That is a very difficult question to answers. It depends what the child is suffering from. Teething pain, fever, a cold are all different problems. If the fever is severe it could take a few doses and several hours, if it's a tooth problem and not serious as little as an hour. Please note - ALWAYS follow the directions on the packet and consult your doctor before medicating any child. Read the directions, and warnings. The more you know the better able you are to take care of your child. The folks at Tylenol are ready to answer all your questions. You can call the Consumer Relationship Center at 1-800-962-5357 Monday through Friday, 9:00 am to 4:30 pm EST.

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17y ago

What else can I help you with?