This document discusses various antimycobacterial drugs used to treat tuberculosis and leprosy. It covers first-line drugs like isoniazid and rifampin that are commonly used to treat tuberculosis, as well as alternative second-line drugs that may be used when drug resistance develops. It also discusses drugs used to treat leprosy, including dapsone and clofazimine, providing information on their mechanisms of action, resistance, pharmacokinetics, and adverse effects.