At lower doses, meloxicam is more similar to Celebrex (celecoxib) than it is to other NSAIDs, like ibuprofen or naproxen, because it is relatively selective for the COX-2 enzyme. But at higher doses, even within the prescribed range, meloxicam can inhibit both COX-1 and COX-2 enzymes, which may lead to side effects like stomach ulcers or bleeding. COX-2 selectivity is a dose-related effect.