It was co-promoted by Monsanto Company (parent company of Searle) and Pfizer under the brand name Celebrex. Monsanto merged with Pharmacia, from which the Medical Research Division was acquired by Pfizer, giving Pfizer ownership of Celebrex. Learn about the side effects of Celebrex (celecoxib), from common to rare, for consumers and healthcare professionals. Celecoxib is a nonsteroidal anti-inflammatory drug (NSAID) used to treat mild to moderate pain and help relieve symptoms of arthritis (eg, osteoarthritis, rheumatoid arthritis, or juvenile rheumatoid arthritis), such as inflammation, swelling, stiffness, and joint pain. Celebrex (Celecoxib) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Overview: Celecoxib is used for pain and swelling caused by arthritis and other conditions. Common side effects include stomach pain, upset stomach, heartburn, nausea, or dizziness. While all nonsteroidal anti-inflammatory drugs (NSAIDs) carry a warning that users have an increased risk for heart attacks and strokes, celecoxib is closely linked to two similar drugs that were taken off the market due to concerns about their cardiovascular safety. Celebrex is a nonsteroidal anti-inflammatory drug (NSAID). It works by reducing hormones that cause inflammation and pain in the body. Celebrex is used to treat pain or inflammation caused by many conditions such as arthritis, ankylosing spondylitis, and menstrual pain. CELEBREX is used to treat pain and redness, swelling, and heat (inflammation) from osteoarthritis, rheumatoid arthritis, juvenile rheumatoid arthritis in patients 2 years and older, and ankylosing spondylitis; for the management of acute pain in adults, and for the management of menstrual cramps. Celebrex (celecoxib) is a medication that treats mild to moderate pain and inflammation. It’s a type of NSAID. Celebrex (generic name: celecoxib) is a prescription drug used to treat osteoarthritis, rheumatoid arthritis, and pain. It's a selective COX-2 inhibitor, which means it inhibits the COX-2 enzyme that induces pain and inflammation, while sparing the COX-1 enzyme that protects the gastric.