UNIT-8- Drugs used in treatment of communicable diseases (common infections, infestations) Drugs Used in the Treatment of Communicable Diseases (Common Infections and Infestations) Communicable diseases are caused by infectious agents such as bacteria, viruses, fungi, and parasites. The treatment of these diseases requires specific antimicrobial, antiviral, antifungal, or antiparasitic drugs. Below is a comprehensive list of the major drugs used in the treatment of common communicable diseases. 1. Bacterial Infections