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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.
For kids under 6 months, infant acetaminophen (such as Tylenol) is the only recommended fever reducer. Older babies and kids can also take children's ibuprofen (such as Motrin or Advil), which is more effective at fighting fever but also somewhat more likely to cause stomach irritation.lso call your pediatrician if your child is under 2 and her fever lasts more than 24 hours (for older kids, you can wait three days before calling unless she has symptoms suggestive of seasonal flu or H1N1).