Introduction Foscavir is an antiviral medicine used for treating infections caused by certain viruses, especially in people whose immune systems are weak or compromised. It becomes particularly important in cases where standard antiviral treatments fail or when viruses become resistant. Because of its potency and specific uses, Foscavir is given under close medical supervision and plays a significant role in managing resistant or severe viral infections.¹ Understanding Herpesvirus Infections in Immunocompromised Patients When treatments like cytolytic and cytotoxic drugs weaken the body's defenses , even normal resident microbes of the skin, gut, and environment, along with viruses already latent in the body such as the human herpesviruses, can become highly pathogenic. This shift increases the number of patients experiencing exaggerated herpetic infections that may become life threatening. 2 Early recognition of infection, rapid and sp...