Greenish stools suggest inadequate feeding , starvation stools or may also be a reflection of some pigments in your own food or drug intake. Kindly breast feed exclusively on demand or at least every three hours and empty one breast thoroughly before switching to the next during feeding...Also kindly check your food and all intakes generally

Hello ma'am, if the drugs were prescribed by your doctor and he/she is
aware you are breastfeeding then there is nothing wrong with taking the
drugs. Kindly avoid self medications but follow your doctor's
instructions. If you have any doubts or complaints please let the Doctor
know. Kind regards.