Micafungin is primarily used as an antifungal medication to treat and prevent serious fungal infections. It is particularly effective against Candida species, including those resistant to other antifungal agents. The drug is commonly administered intravenously in hospital settings for patients with compromised immune systems, such as those undergoing chemotherapy, organ transplants, or suffering from HIV/AIDS. It is also used to treat invasive candidiasis and esophageal candidiasis. Additionally, micafungin is often prescribed as a prophylactic treatment to prevent fungal infections in high-risk patients, such as those undergoing stem cell transplantation. Its mechanism of action involves inhibiting the synthesis of beta-glucan, an essential component of fungal cell walls, leading to cell lysis and death. Due to its targeted action and low toxicity, it is considered a safer option compared to other antifungal drugs in certain clinical scenarios.