Give examples of medicinal drugs as enzyme inhibitors.

Viral pathogenesis usually involves the virus building new protein coats by use of viral protease enzyme. These infections can be treated by administration of drugs which inhibit the protease enzyme, (usually competitive inhibition) and hence inhibits formation of new viral protein coats.

Penicillin is an antibiotic, and it's mechanism of action involves Inhibition of an enzyme responsible for forming cross-links in bacteria cell walls. With a weakened or no cell wall, it leaves bacteria susceptible to outside water and molecular pressures, resulting in cell death.