Celecoxib (Celebrex) is used to relieve the pain, tenderness, inflammation (swelling), and stiffness caused by arthritis. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. Capsules Chemical Name: CELECOXIB ( ce-le-KOX-ib) Possible Uses of This Medication This medicine is a nonsteroidal anti-inflammatory drug ( NSAID) known as a COX-2 inhibitor used to relieve the symptoms of osteoarthritis and rheumatoid arthritis in adults. More info... Before using Some medicines or medical conditions may interact with this medicine. INFORM YOUR DOCTOR OR PHARMACIST of all prescription and over-the-counter medicine that you are taking. More info... How to take this medication Follow the directions for using this medicine provided by your doctor. This medicine may come with a patient information leaflet. Ask your doctor, nurse, or pharmacist any questions you may have about this medicine. More info... Cautions DO NOT TAKE THIS MEDICINE IF YOU HAVE HAD A SEVERE ALLERGIC REACTION to aspirin or any medicine containing aspirin or to a nonsteroidal anti-inflammatory drug ( such as Feldene, Motrin, Naprosyn, Clinoril). DO NOT TAKE THIS MEDICINE IF YOU HAVE HAD A SEVERE ALLERGIC REACTION to a sulfonamide antibiotic ( Septra DS, Bactrim DS, Gantrisin). More info... Possible side effects SIDE EFFECTS that may occur while taking this medicine include diarrhea, indigestion, gas, nausea, or headache. If they continue or are bothersome, check with your doctor. More info... Drug interactions Drug interactions can result in unwanted side effects or prevent a medicine from doing its job. More info... Missed Dose IF YOU MISS A DOSE OF THIS MEDICINE and you are taking 1 dose daily, take the missed dose if you remember the same day. More info... Storage Store at room temperature away from sunlight and moisture. More info... Other Information DO NOT SHARE THIS MEDICINE with others for whom it was not prescribed. More info...