use of drugs in pregnancy

extract   until recent years pharmacological researches focused on pathogeneses and abnormality in organogenesis but now researchers are studying drugs physiological disorders in pregnancy. these studies are specially focused on mothers and fetus, regulatory mechanism of passing drugs through placenta and movement of drug' materials between barriers of milk and blood in the breast. also the physiological changes for compensate of hormones, body fluids, fat tissues and blood volume are studying.   nine month of pregnancy would be in observations for wide spread interactions between mother and infant.