And for example, one very common type of medicinal drug is aspirin. This basically is used to relieve headaches, to relieve different types of pains and so forth. Now, almost every single type of medicine will have some type of effect on that developing fetus as long as that medicine can get across as long as that drug can get across the membrane of the placenta. For example, aspirin can lead to maternal as well as fetal bleeding and that can produce many different types of problems. So before actually taking any type of medicinal drug, that pregnant woman should consult her physician. Now what about recreational drugs?