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Some teratogens are dangerous throughout a pregnancy and some are dangerous only at specific points of embryonic development. The only safe course of action is to actively avoid known teratogens before and during pregnancy. The list below is not all inclusive but does list some well known and dangerous agents that are proven teratogens.


Common Teratogens. and Their Effects What is a teratogen? l Is any factor, chemical or physical, that adversely affects the fertilized ovum, embryo or fetus. l Is any agent that can induce or increase the incidence of a congenital malformation.


There will always be teratogens around, but these teratogens would not be a threat just as long as the mother recognizes what these are and gets rid of them the way she possibly can. Here are some of the common teratogens and the effects it gives to the growing baby. Radiation. Everyday every one of us is exposed to different radiations.


The four most common teratogens are tobacco, alcohol, medications and illegal drugs. Teratogens are substances that could harm a developing fetus by affecting growth and causing birth defects or death. The use of tobacco during pregnancy is dangerous because the smoke causes the blood vessels to constrict.


Examples of Teratogens. There are many different examples of teratogens that cause birth defects. Listed in the directory below are some, for which we have provided a brief overview. Fetal Alcohol Syndrome (FAS) Phenytoin (Dilantin) Varicella


Teratogens are drugs, chemicals, or even infections that can cause abnormal fetal development. There are billions of potential teratogens, but only a few agents are proven to have teratogenic effects.


Teratogens are substances that can cause harm in a developing fetus resulting in birth defects or fetal death. Teratogens affect growth and development of the baby. The effect of the teratogen depends on the specific substance and how much exposure has occurred. Common teratogens include alcohol, tobacco, illegal drugs and medications.


the teratogen, if it is to have any effect, will be so profound as to cause a spontaneous abortion. Some examples of teratogens known to cause human confirmation are listed in the table below. A few of the most common examples will be discussed below.




Teratogens are agents that affect normal development and can give rise to congenital birth defects. For the most part, teratogens are considered to be chemical agents, such as thalidomide or alcohol. However, perinatal infections with cytomegalovirus would fall into this broad category as would significant radiation exposure.