Girls, on the breastfeeding you took pills that weren't combined with …

Girls, on the breastfeeding you took pills that weren't combined with breastfeeding? I have been coughing for a few days and there is a strong attack that I can't stop. They prescribed me pills and said to express milk, but something doesn't make sense to me, because I was in a hurry to take care of my child. I took the pills and after two hours I expressed milk and gave it to him, is this normal according to you?