What common condition can Hydroxychloroquine NOT treat?

Hydroxychloroquine is an antimalarial medication that is primarily used in the treatment of several autoimmune conditions such as rheumatoid arthritis and systemic lupus erythematosus (lupus). Additionally, it is effective against malaria, specifically as a prophylactic treatment and in the management of uncomplicated cases.

Cystic fibrosis, however, is a genetic disorder characterized by the production of thick mucus that affects the lungs and digestive system, which is not an autoimmune condition or a parasitic infection. Hydroxychloroquine does not have a therapeutic role in treating cystic fibrosis, which would require management that typically focuses on respiratory care, nutrition, and may include other medications specific to the condition.

Therefore, the correct answer highlights that hydroxychloroquine is not indicated for treating cystic fibrosis, as its mechanisms and applications do not address the underlying pathology of this genetic disease.