Ketorolac (Toradol) is a very potent NSAID and is used for treating severe pain that normally would be managed with narcotics. Ketorolac causes ulcers more frequently than other NSAIDs and should not be used for more than five days. Celecoxib (Celebrex), blocks COX-2 but has little effect on COX-1. Therefore, celecoxib (Celebrex) is sub-classified as a selective COX-2 inhibitor, and it causes fewer ulcers and less bleeding than other non-selective NSAIDs.