Fertility drug therapies: past, present, and future.

Throughout the last 30 years there has been an evolution of drug therapies aimed at the treatment of infertility. These agents primarily address the induction of ovulation or enhancing ovulation by allowing more oocytes to mature simultaneously. As this evolution has progressed, drugs have moved away from human products to the advent of the recombinant or genetically engineered technology. The drugs have not cured infertility, but they have affected positively the quest of families confronted by infertility.