The full name of Hydroxychloroquine Tablets should be Hydroxychloroquine Sulfate Tablets, which are administered orally, with the initial dose of treatment being 400mg per day and the maintenance dose being 200mg per day. 1. Hydroxychloroquine Sulfate Tablets are primarily used for the treatment of chronic arthritis in adolescents, discoid and systemic lupus erythematosus, rheumatoid arthritis, and sun-induced or exacerbated skin lesions. 2. The first dose of this product for adults is usually 400mg per day. When the efficacy of this product cannot be further improved by divided doses, the dose can be reduced to 200mg for maintenance, and if the therapeutic response is weakened, the maintenance dose needs to be increased to 400mg per day. 3. Children should use the smallest effective dose, which should not exceed 6.5mg/kg/day or 400mg/day, or even a smaller amount is needed, and it is prohibited for children younger than six years old. 4. Each dose requires milk or food at the same time, the product has a cumulative effect and takes several weeks to work. 5. Patients may experience adverse reactions such as visual field defects, retinal pigmentation changes, corneal edema and turbidity, rash, nausea, diarrhea, dizziness, tinnitus, and other adverse reactions after taking the drug. 6. Hydroxychloroquine sulfate tablets are contraindicated in patients who are allergic to the product, patients with macular degeneration of the eye and children under six years of age. It is recommended that patients who need to use Hydroxychloroquine Sulfate Tablets should go to regular hospitals in time, and follow the doctor’s instructions for symptomatic use of medication.