What does hydroxychloroquine sulfate do to our body?

Plaquenil (hydroxychloroquine): Hydroxychloroquine, an anti-malarial, is used to treat RA and SLE. Although called "immune-suppresive" it does not have a powerful effect on the immune system. We are still understanding how it works and in general it regulates the communication of immune cells / lymphocytes. More precisely, it reduces toll-like receptors signaling, which reduces immune cell activation and inflammation.