What Are Teratogens In Pregnancy?
What Are Teratogens In Pregnancy? A teratogen is any agent that causes an abnormality following fetal exposure during pregnancy. Teratogens are usually discovered after an increased prevalence of a particular birth defect. For example, in the early 1960’s, a drug known as thalidomide was used to treat morning sickness. What is the most common teratogen?