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Pregnancy: Pregnancy Category C. Beta-blockers may cause bradycardia in the fetus and newborn infant. No studies have been performed on the use of atenolol in the first trimester and the possibility of fetal injury cannot be excluded. Chronic administration of atenolol to pregnant women in the management of mild to moderate hypertension has been associated with intrauterine growth retardation. The use of atenolol in women who are, or may become pregnant requires that the anticipated benefit justify the potential risks to the fetus, particularly in the first and second trimesters, since beta-blockers, in general, have been associated with decreased placental perfusion resulting in intrauterine deaths, immature and premature deliveries.
Lactation: Exercise caution when atenolol is administered to a breastfeeding woman as it can be excreted in human milk. Neonates of mothers who receive atenolol during breastfeeding may be at risk of hypoglycemia and bradycardia.
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