HYQ 200mg Tablet contains Hydroxychloroquine 200mg, an antimalarial and immunomodulatory agent primarily used in the treatment and prevention of malaria, as well as autoimmune diseases such as rheumatoid arthritis and systemic lupus erythematosus. Hydroxychloroquine acts by interfering with lysosomal activity and antigen presentation in immune cells, thereby reducing inflammation and modulating the immune response. It is effective in reducing disease activity and preventing flare-ups in autoimmune conditions. The tablet is administered orally, with dosage and duration tailored according to the specific indication and patient response. Common side effects may include gastrointestinal disturbances such as nausea, vomiting, and abdominal discomfort, as well as headache and dizziness. Rare but serious adverse effects include retinopathy, which necessitates regular ophthalmologic monitoring during prolonged therapy. Caution is advised in patients with pre-existing retinal or visual field abnormalities, hepatic or renal impairment, and those with a history of hypersensitivity to hydroxychloroquine or related compounds. HYQ 200mg should be used under medical supervision, with periodic assessment to ensure efficacy and safety. It is contraindicated in individuals with known hypersensitivity to hydroxychloroquine and should be avoided during pregnancy unless clearly indicated by a healthcare professional.