Infen Plaster contains Ketoprofen 30 mg as its active ingredient, a nonsteroidal anti-inflammatory drug (NSAID) used for the topical treatment of musculoskeletal pain and inflammation. Ketoprofen acts by inhibiting cyclooxygenase enzymes (COX-1 and COX-2), thereby reducing the synthesis of prostaglandins, which are mediators of inflammation and pain. Infen Plaster is indicated for symptomatic relief of acute and chronic conditions such as strains, sprains, contusions, tendonitis, bursitis, and osteoarthritis. The plaster provides localized delivery of ketoprofen, allowing targeted anti-inflammatory and analgesic effects while minimizing systemic exposure and associated adverse effects. It is applied directly to the affected area, ensuring sustained release of the active compound over an extended period. Patients should apply the plaster to clean, dry skin and avoid application on damaged or irritated skin. Common side effects may include mild local reactions such as erythema, itching, or rash. Use of Infen Plaster should be avoided in individuals with known hypersensitivity to ketoprofen or other NSAIDs, as well as in those with a history of asthma or allergic reactions related to NSAIDs. Consultation with a healthcare professional is recommended prior to use, especially in patients with pre-existing medical conditions or those taking concomitant medications.