Yes,  taking drugs while breastfeeding is very dangerous for the newborn. It can create a lot of troubles like seizures and vomiting, and, sometimes, it can impact ill effects on an infant’s brain. Although in some conditions, the mother is taking drugs that their gynecologist prescribes. And they are aware of the impacts it can create, and the doctor explains all the terms and issues before prescription, but in case you think the problem is more significant, then go and tell all things to your gynecologist.