Category A, B, C, D, X (Drugs):SFAF
FDA pregnancy risk categories
that indicate risk to a fetus from maternal use of a drug. Category A
drugs have not shown a risk in controlled studies. Category B drugs either
have not been tested in animals or show adverse effects in animals which
have not been confirmed in humans. Category C means that no controlled
studies have been done in humans. Category D indicates that there is evidence
of human fetal risk, but the benefits of the drug may outweigh the risk.
Category X includes drugs which in animal and human studies (or common
experience) have been shown to cause fetal abnormalities.
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