Drugs and Reproduction
during the first trimeter the embryo is highly sensitve to drugs (during this time all the structures are developing)
thalidomide missing or deformed arms and leggs.  
antibiotic streptomycin: hearing problems and nervous system problems.
 
retaloic acid
facial and cranial deformities

antibiotic tetracycline causes yellow teeth

cocaine
small fetus due to lack of oxygen, may have problems with emotional and social development
 
Alcohol
fetal alcohol syndrom, 3rd most common cause of mental retardation in the US. present in 60 to 70% of alcoholic women