Answer :

Final answer:

Tetracyclines, a group of antibiotics, is contraindicated in pregnancy as it can darken the teeth of a newborn. Other harmful substances during pregnancy are termed as teratogens, including substances like heroin.

Explanation:

The medicine that is contraindicated in pregnancy because it can darken the teeth of a newborn is a group of antibiotics known as

tetracyclines

. Tetracyclines have a risk of causing discolored teeth and possible bone problems in a developing fetus. They are therefore contraindicated, meaning they are recommended not to be used, during pregnancy. It's important to note that substances such as

heroin

, cocaine, methamphetamines and some prescription and over-the-counter medications are also considered harmful during pregnancy. They are termed

teratogens

: substances that may produce physical or functional defects in the fetus.

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