Here's a quote for what it's worth. Of course, check with your doc.
"The FDA recommends that you consider the following:
- 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.
- If you need to take ibuprofen more often, talk to your doctor about medication alternatives. Your doctor may recommend a painkiller that does not interfere with the effect of low-dose aspirin"