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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.
Report Abuse. Ibuprofen (motrin) will take aproximatly 15-20 minutes to take effect. It is also very unsafe to take more than 800 mg every 12 hrs. Mortin is very rough on the GI tract and specifically the stomach.Take it with food or milk. If the mortin isnt working it may be time to see a doctor. You may also try taking Tylenol in a rotation with the motrin.