Dr. hereirra warned a pregnant patient that her recreational use of a particular drug might cause harm to her fetus. the drug would be classified as:______.

A teratogen is something that can cause birth defects or abnormalities in a developing embryo or fetus upon exposure.
Teratogens include some medications, recreational drugs, tobacco products, chemicals, alcohol, certain infections, and in some cases, health problems such as uncontrolled diabetes in pregnant people.
Exposure to a teratogen can occur through ingestion or environmental exposure during pregnancy.

What is most damaging teratogen?

critical period of exposure appears to be from the second to the fifth week of gestation. The most common malformations include craniofacial dysmorphisms, cleft palate, thymic aplasia, and neural tube defects. The tranquilizer thalidomide is one of the most famous and notorious teratogens.

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