Definition: "Anti-" means "against." In a medical context, an antitransmission drug (also known as "antitransmission drug") is a substance that acts against a particular organism or cell to prevent it from replicating. This medicine prevents an organism from making copies of itself, thus preventing the spread of the disease. It's often used in cancer treatment because it reduces the risk of cancer cells becoming resistant to chemotherapy drugs. The word "antitransmission" means the opposite of transmission; it refers to a process that takes place after infection, not before. This medicine prevents an organism from transmitting its genetic material or enzymes to other organisms. Antitransmission agents are typically used in immunosuppressive therapies (like corticosteroids), where they're used to treat immune suppression caused by autoimmune diseases, such as multiple sclerosis, rheumatoid arthritis, and lupus erythematosus.