"Organ formationin fetus occurs in the first 3 months:
Teratogenic drugs in this period therefore cause structural defects.
From 3 months onwards
teratogenic drugs tend to cause growth defects.
Teratogenic maternal medications maybe be either stopped
switched or dose reduced.
Risk to fetus must always be balanced with the risk to the woman if a medication is stopped.
Exposure to therapeutic drugs accounts for only 2 % of malformations.
Most malformations result from genetic