Liver diseases in pregnancy: Diseases not unique to pregnancy

Table 5 The Food and Drug Administration pregnancy risk categories of medicines

Pregnancy category	Definition
A	Controlled studies show no risk
B	Animal studies show no risk, and there are no human controlled studies. Or animal studies may have revealed an adverse effect that was not reproduced in human controlled studies
C	No human studies and either animal studies show an adverse effect or there are no studies available. Use if the risk is justified
D	Positive evidence of risk in human studies, only if the potential benefits outweigh the risk
X	Contraindicated in pregnancy: Risk is confirmed in animal and human studies and outweighs any advantage