Fertility drug | pharmacology | Britannica (original) (raw)

Learn about this topic in these articles:

cause of multiple births

• 
  In infertility: Treatment options
  However, these “fertility drugs” also increase a woman’s chances of having multiple births, owing to the release of more than one egg at ovulation under the influence of the drug.
  Read More
• 
  In multiple birth: Twins and twinning
  …time, and the use of fertility drugs, which causes the simultaneous ovulation of many eggs. From 2014 to 2018, the twin birth rate began a gradual decline in American women. Reported twinning frequencies throughout the world vary from about 45 in 1,000 (such as among the Yoruba people of Nigeria)…
  Read More