Hydroxychloroquine is a medication primarily used to treat and manage certain autoimmune conditions, including rheumatoid arthritis, lupus erythematosus, and discoid lupus erythematosus. Its mechanism of action involves modulating the immune system and reducing inflammation, thereby alleviating symptoms such as joint pain, swelling, and skin rashes associated with these conditions. Additionally, Hydroxychloroquine 400mg is sometimes prescribed off-label to treat malaria, particularly in regions where malaria strains are susceptible to this medication. However, it's important to note that hydroxychloroquine should only be taken under the supervision of a healthcare professional, as improper use or dosage can lead to serious side effects, including vision problems and cardiac complications. In recent times, hydroxychloroquine gained attention for its potential use in treating COVID-19, but subsequent studies have not supported its efficacy for this purpose, and it is not recommended for this indication.