Amphotericin B is primarily used for which of the following conditions?

Amphotericin B is an antifungal medication that is primarily used to treat serious fungal infections, including fungal meningitis. It works by binding to ergosterol, a key component of fungal cell membranes, leading to cell death. This makes it particularly effective against a range of systemic fungal infections, such as those caused by Cryptococcus neoformans, which is often responsible for meningitis in immunocompromised individuals.

The use of Amphotericin B for viral, bacterial, or parasitic infections is not appropriate, as it specifically targets fungal cells. Hence, its primary application in the treatment of fungal meningitis highlights its role as a critical agent in managing serious fungal diseases, especially in populations vulnerable to such infections.