Why are tetracyclines contraindicated in pregnancy and in young children?

Why are tetracyclines contraindicated in pregnancy and in young children?

• A. They can cause teeth discoloration but have no effect on bone growth
• B. They can cause teeth discoloration and interfere with bone growth
• C. They cause hepatotoxicity
• D. They are safe to use during pregnancy

Answer: (B)

Tetracyclines have a strong affinity for calcium and become incorporated into calcifying tissues as they form, especially developing teeth and growing bone. When exposure occurs during tooth development, they deposit in dentin and enamel, causing permanent yellow-to-gray-brown discoloration and enamel defects. In the skeleton, this calcium binding can interfere with normal bone growth during periods of rapid development. Because these effects are irreversible and the drug can cross the placenta and appear in breast milk, tetracyclines are avoided in pregnancy and in young children. Other issues like hepatotoxicity exist but are not the primary reason for the restriction, and saying they’re safe in pregnancy is incorrect.

Tetracyclines have a strong affinity for calcium and become incorporated into calcifying tissues as they form, especially developing teeth and growing bone. When exposure occurs during tooth development, they deposit in dentin and enamel, causing permanent yellow-to-gray-brown discoloration and enamel defects. In the skeleton, this calcium binding can interfere with normal bone growth during periods of rapid development. Because these effects are irreversible and the drug can cross the placenta and appear in breast milk, tetracyclines are avoided in pregnancy and in young children. Other issues like hepatotoxicity exist but are not the primary reason for the restriction, and saying they’re safe in pregnancy is incorrect.