Qustain P 1000 Tablet is used for relieving mild to moderate pain and reducing fever. It contains Paracetamol 1000 mg in a bilayered formulation, with 300 mg as immediate release and 700 mg as sustained release, ensuring fast and long-lasting relief for up to 8 hours. This medicine is effective for headaches, migraines, musculoskeletal pain, toothaches, menstrual pain, and fever. Paracetamol works by inhibiting COX enzymes and reducing prostaglandin synthesis, targeting pain and fever at the source. Its sustained release formulation maintains therapeutic blood levels for consistent relief.