What is atovaquone?
Atovaquone is a medication that interferes with the reproduction of protozoa (single-cell organisms) that can cause disease in the body. Atovaquone is used to treat or prevent pneumonia caused by a fungal infection called Pneumocystitis carinii (also called Pneumocystis jiroveci). Atovaquone may also be used for other purposes not listed in this medication guide.