Flexjak ER 11mg Tablet contains Tofacitinib 11mg, an oral medication primarily used to treat autoimmune conditions such as rheumatoid arthritis, psoriatic arthritis, and ulcerative colitis. Tofacitinib belongs to a class of drugs known as Janus kinase (JAK) inhibitors, which work by blocking specific enzymes involved in the inflammatory process, thereby reducing inflammation and immune system overactivity. This extended-release formulation allows for a controlled and sustained release of the active ingredient, ensuring consistent therapeutic effects throughout the day with once-daily dosing. Flexjak ER is prescribed to patients who have had an inadequate response or intolerance to other disease-modifying antirheumatic drugs (DMARDs). By modulating the immune response, it helps alleviate symptoms such as joint pain, swelling, stiffness, and skin lesions, improving overall physical function and quality of life. Patients should take this medication exactly as directed by their healthcare provider and report any side effects, which may include infections, headache, diarrhea, or elevated cholesterol levels. Regular monitoring of blood counts and liver function is recommended during treatment. Flexjak ER should be used with caution in individuals with a history of infections or liver disease, and it is not suitable for pregnant or breastfeeding women without medical advice.