Hydroxychloroquine is used to treat a number of different inflammatory conditions, including rheumatoid arthritis, juvenile arthritis, and lupus erythematosus(systemic lupus erythematosus (SLE) and discoid erythematosus). These are all autoimmune diseases. This means that your immune system, which normally protects your body from infections, mistakenly attacks itself. This causes pain and damage to parts of your body, particularly your joints or skin. Hydroxychloroquine suppresses the immune reaction, and this helps to reduce the damage caused.
This is a companion discussion topic for the original article at https://patient.info/medicine/hydroxychloroquine-tablets-quinoric