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Category X Drug
(redirected from Class X Drug)

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Category X Drug
A drug with a very high teratogenic risk to a fetus, based on controlled animal studies, which is contraindicated for use during pregnancy
Examples Accutane, thalidomide, vitamin A congeners, Xanax

category X drug
Pharmacology A therapeutic with known teratogenicity which is contraindicated for use during pregnancy–eg, vitamin A congeners–for severe acne–which cause a characteristic syndrome in neonates. See Vitamin A embryopathy.


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