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. Celebrex (Celecoxib) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Celebrex is a nonsteroidal anti-inflammatory drug (NSAID) used to treat arthritis, menstrual cramps, and other types of short-term pain. 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. Learn about the side effects of Celebrex (celecoxib), from common to rare, for consumers and healthcare professionals. Celebrex (celecoxib) is a medication that treats mild to moderate pain and inflammation. It’s a type of NSAID. Celebrex (celecoxib) is a prescription capsule used for osteoarthritis, other forms of arthritis, pain, and menstrual cramps. Learn about side effects and more. 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. 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. 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.