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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.
If you use ibuprofen occasionally, there is only a minimal risk that the ibuprofen will interfere with the effect of low-dose aspirin. If you need only a single dose of ibuprofen, take it eight hours before or 30 minutes after taking a regular (not enteric-coated) low-dose aspirin.