HCQS 200 is a brand name for hydroxychloroquine sulfate 200 mg, a prescription medication primarily used to treat autoimmune and inflammatory conditions. Doctors commonly prescribe HCQS 200 for rheumatoid arthritis and systemic lupus erythematosus (SLE), where it helps reduce inflammation, joint pain, skin symptoms, and disease flare-ups. It is also used in the prevention and treatment of certain types of malaria, as hydroxychloroquine works by interfering with the growth of parasites in red blood cells. When taken regularly under medical supervision, HCQS 200 can help manage long-term autoimmune conditions and improve quality of life.