Parecoxib Sodium is primarily used in medical settings for the management of acute pain. It is often administered post-surgery to help alleviate moderate to severe pain, such as after orthopedic or abdominal procedures. The drug works by inhibiting the enzyme cyclooxygenase-2 (COX-2), which reduces the production of prostaglandins, substances that cause inflammation and pain. Due to its selective COX-2 inhibition, it is associated with fewer gastrointestinal side effects compared to non-selective NSAIDs. It is typically given as an injection, allowing for rapid onset of pain relief, making it suitable for use in hospital environments where immediate pain control is necessary. However, its use is usually short-term, as prolonged administration may increase the risk of cardiovascular events. It is often preferred in cases where oral medications are not feasible or effective.