Rapidus (Diclofenac potassium) is a nonsteroidal anti-inflammatory drug (NSAID) that provides rapid analgesic, anti-inflammatory, and antipyretic effects by inhibiting cyclooxygenase (COX) enzymes and reducing prostaglandin synthesis. It is commonly used for the short-term management of acute mild to moderate pain, such as musculoskeletal pain, dental pain, and post-operative pain.