HCQS 200mg is a medication that contains hydroxychloroquine sulfate as its active ingredient. Buy hydroxychloroquine online is primarily used to treat malaria, rheumatoid arthritis, and lupus erythematosus. In recent years, it has gained attention for its potential use in treating COVID-19, although its efficacy for this purpose is still under investigation and has been a topic of debate. Hydroxychloroquine works by interfering with the communication between cells of the immune system, which can help reduce inflammation and the activity of the immune system. This mechanism of action is why it is used to treat autoimmune diseases like rheumatoid arthritis and lupus. It's important to note that HCQS 200 mg should only be taken under the supervision of a healthcare professional, as it can have side effects and may interact with other medications. Additionally, it should not be used to prevent COVID-19 unless specifically prescribed by a healthcare provider.