The document describes various drug regimens used for the prevention of mother-to-child transmission (PMTCT) of HIV during pregnancy, childbirth, and postpartum. It discusses the use of antiretroviral therapy (ART) and prophylaxis with drugs like nevirapine and AZT to reduce transmission. Common regimens involve mothers taking antiretrovirals during late pregnancy and labor, and giving the infant prophylaxis after birth. The risks and benefits of different drug options are considered, as well as monitoring treatment to support both mother and child.