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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.
I just saw that I was not supposed to have any ibuprofen for at least 7 days prior to my surgery. No one mentioned this while going over anything. I had my period last week and took ibuprofen and tylenol to help with the pain. The last time I took it was Thursday, which will be 5 days before my surgery.