Misonac 100mg/100mcg Tablet SR is a delayed-release, sustained-release formulation of diclofenac, a non-steroidal anti-inflammatory drug (NSAID), in combination with misoprostol, a gastrointestinal mucosal protective agent. This combination tablet is indicated for the treatment of pain and inflammation in patients with rheumatoid arthritis, osteoarthritis, and ankylosing spondylitis, as well as for the relief of menstrual cramps and dysmenorrhea. Diclofenac, the active ingredient, works by inhibiting the production of prostaglandins, which are responsible for pain and inflammation, thereby providing relief from these symptoms. Misoprostol, on the other hand, helps to protect the gastrointestinal mucosa from the potential damage caused by diclofenac, thereby reducing the risk of gastrointestinal ulcers and bleeding. The sustained-release formulation of Misonac allows for a steady release of the active ingredients over an extended period, providing a prolonged duration of therapeutic effect.