What is Plaquenil primarily used for?

Plaquenil, generically known as hydroxychloroquine, is primarily used for the prevention and treatment of malaria, as well as for the management of autoimmune diseases such as rheumatoid arthritis and lupus erythematosus. Its antimalarial properties work by interfering with the growth of the parasite in red blood cells, while its use in autoimmune conditions is attributed to its ability to modulate the immune system and reduce inflammation. This dual functionality makes it an important medication for patients with these conditions.

In contrast, the other options do not accurately reflect the primary uses of Plaquenil. For instance, skin infections are typically treated with antibiotics or antifungal medications, muscle pain often involves pain relievers or muscle relaxants, and osteoarthritis is usually managed with nonsteroidal anti-inflammatory drugs (NSAIDs) and not with hydroxychloroquine. Understanding these distinctions is crucial for effective pharmaceutical practice and patient care.