Roferon-A is a brand name for interferon alfa-2a, a type of medication known as an interferon, which is used in the treatment of various viral infections and certain types of cancer. Interferon alfa-2a is a recombinant form of a naturally occurring protein in the body that plays a critical role in the immune response against pathogens and tumor cells. Roferon-A works by enhancing the immune system's ability to fight off diseases. It is commonly prescribed for conditions such as chronic hepatitis B and C, certain types of leukemia (like hairy cell leukemia), and kidney cancer. The medication is administered through injections and its use can be associated with a range of side effects, which necessitates close monitoring by healthcare professionals.