core + health-lifesci (Health and Lifesciences Extension): terms relating to healthcare, medicine and the life sciences.


Defined in the extension.
Canonical URL:

Thing > Intangible > Enumeration > MedicalEnumeration > DrugPregnancyCategory :: FDAcategoryA

A designation by the US FDA signifying that adequate and well-controlled studies have failed to demonstrate a risk to the fetus in the first trimester of pregnancy (and there is no evidence of risk in later trimesters).

Schema Version 3.3