Which pregnancy category is Labetalol classified under?

Labetalol is classified under "No assigned category" regarding pregnancy safety. This designation indicates that there is no definitive evidence from well-controlled studies in pregnant women to classify the drug within the established A, B, C, or X categories defined by the FDA. The lack of classification suggests that existing data either does not adequately assess the risk or benefits in pregnant populations or that more research is needed to understand its effects during pregnancy.

Pregnancy categories are used to communicate the potential risks and benefits of medications during pregnancy, with Category A indicating no known risk, Category X indicating contraindications due to risk of fetal harm, and Category C suggesting that risks may exist but may be outweighed by benefits in certain situations. Therefore, Labetalol's status as "no assigned category" reflects uncertainty and possible limitations in the data available to effectively categorize its use in pregnancy.