You should never, ever combine NSAIDs. Taking ibuprofen and aspirin at the same time is flirting with disaster, as Foot Notes can attest.
Aspirin can cause GI ulcers all by itself, but all NSAIDs, even the newer ones, have that potential because they work by the same pathways (COX1 and COX2 inhibition). When you combine them you can get into serious trouble. If you have to change NSAIDs, you should ideally give your body a couple week “wash out” period.
Excessive use of any NSAIDS can CAUSE kidney damage, too.
Common NSAIDS include: aspirin, ibuprofen, naproxen, ketoprofen, Celebrex, Vioxx, meloxicam (Mobic), Bextra, and many more
Unless there is a very pressing medical reason and your doctor has carefully weighed the risks, another combination to avoid at all costs is an NSAID with any oral steroid medication (prednisone, prednisolone, dexamethasone, etc.). Frankly, you should even be careful with some topical steroids and NSAIDS, since some of the potent steroids can be absorbed systemically. This combination also carries a very high risk of GI ulceration. So, if you’re on prednisone for poison ivy, for example, avoid any NSAIDs during that time, and if you can avoid it, give your body a few extra days to flush the steroids out before starting any NSAIDs again.
As for Tylenol, please keep in mind that the margin of safety with this drug is quite narrow, so you should be very careful with it, too. If you take Tylenol, be very careful that there is no additional acetominophen in any other meds you are taking (cold meds, Rx pain meds, etc.). Acetominophen will destroy your liver PDQ if you go over the rec. dosage, and is a common cause of acute liver failure.
Don’t be afraid to take pain meds when you need them, but you should never mix them unless you know exactly what you are doing and have consulted a doctor first.
Chipper