Etroclas MR Tablet is a modified-release formulation containing Etoricoxib, a non-steroidal anti-inflammatory drug (NSAID) that selectively inhibits the enzyme COX-2. It is primarily used to relieve pain and inflammation in conditions like osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis. The modified-release (MR) design allows for the gradual release of the active ingredient, ensuring sustained pain relief over a longer period.