ZY-Q 200 Tablet contains Hydroxychloroquine 200 mg, an antimalarial and immunomodulatory agent commonly used in the treatment of malaria, rheumatoid arthritis, and systemic lupus erythematosus. Hydroxychloroquine exerts its therapeutic effects by interfering with lysosomal activity and autophagy, modulating the immune response, and inhibiting the replication of certain intracellular pathogens. It is indicated for the prophylaxis and treatment of acute attacks of malaria caused by Plasmodium species sensitive to the drug. Additionally, it is employed as a disease-modifying agent in autoimmune conditions such as rheumatoid arthritis and lupus erythematosus to reduce inflammation, pain, and tissue damage. The recommended dosage varies depending on the indication, patient weight, and clinical response, and should be determined by a healthcare professional. Common adverse effects may include gastrointestinal disturbances, headache, dizziness, and skin rash. Prolonged use requires regular ophthalmologic monitoring due to the risk of retinopathy. Caution is advised in patients with preexisting retinal or visual field changes, hepatic or renal impairment, and those taking concomitant medications that may interact with hydroxychloroquine. ZY-Q 200 Tablet should be used under strict medical supervision to ensure efficacy and minimize potential toxicity.