Malaria brought on by mosquito bites can be prevented or treated with hydroxychloroquine 200 mg. In order to prevent and cure malaria in various regions of the world, the US Centers for Disease Control regularly updates their advice for travelers. Before visiting regions where malaria is present, discuss the most recent information with your doctor. Some auto-immune illnesses are also treated with this drug (lupus, rheumatoid arthritis). It is a member of a group of pharmaceuticals called disease-modifying antirheumatic drugs (DMARDs). It can lessen lupus-related skin issues as well as arthritis pain and swelling.