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According to my doctor, 4 hours. You can switch them up. Take acetaminophen, (Tylenol), then wait 4 hours and take Ibuprofen, wait another 4 hours and take acetaminophen and so on. :) 15 people found this useful.
TylenolÂ® (Acetaminophen) Given every 4 â 6 hours as needed for fever/pain. Do not administer if child is less than 3 months old without speaking to us first! *As of August 2011, manufacturers are changing the concentration of Infants' Acetaminophen.