List of products in the National Drug Code with proprietary name . This drug is used with probenecid to treat a certain viral eye infection (retinitis due to cytomegalovirus-CMV) in people with AIDS. It lowers your risk of blindness and other vision problems. Cidofovir belongs to a class of drugs known as antivirals. It works by stopping the growth of the virus. Cidofovir is not a cure for CMV retinitis, and your disease may still worsen during and after treatment.