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One characteristic of the FDA definitions of the pregnancy categories is that the FDA requires a relatively large amount of high-quality data on a pharmaceutical for it to be defined as Pregnancy Category A. As a result of this, many drugs that would be labelled as safe in other countries are allocated to Category C by the FDA.
Topical nicotinamide and topical zinc are safe, however, there are no FDA pregnancy category ratings. [27] [28] Topical salicylic acid and topical dapsone are classified as FDA pregnancy category C. [23] [28] Acne medications to avoid during pregnancy include oral isotretinoin and topical tazarotene as there have been reports of birth defects.
Rifapentine has been assigned a pregnancy category C by the U.S. Food and Drug Administration (FDA). Rifapentine in pregnant women has not been studied, but animal reproduction studies have resulted in fetal harm and were teratogenic.
According to the FDA approved prescribing information, levofloxacin is pregnancy category C. [3] This designation indicates that animal reproduction studies have shown adverse effects on the fetus and there are no adequate and well-controlled studies in humans, but the potential benefit to the mother may in some cases outweigh the risk to the ...
Its use during pregnancy is contraindicated, although it has been placed in Australian pregnancy category C. [13] Its use during the first trimester (during organogenesis) and 12 weeks prior to pregnancy has been associated with an increased risk of congenital malformations, especially malformations associated with maternal folic acid ...
The FDA lists chloroxine in Pregnancy Category C (risk cannot be ruled out) because no pregnancy studies on the medication have been performed with animals or humans. For this reason, use of chloroxine oral or topical during pregnancy or when breast-feeding is not recommended. [4]
According to one study, linezolid may need to be given more frequently than normal in people with burns affecting more than 20% of body area, due to increased nonrenal clearance of the drug. [65] Linezolid is in U.S. pregnancy category C, meaning there have been no adequate studies of its safety when used by pregnant women, and although animal ...
The following is a list of antibiotics. The highest division between antibiotics is bactericidal and bacteriostatic. Bactericidals kill bacteria directly, whereas bacteriostatics prevent them from dividing. However, these classifications are based on laboratory behavior.