Pregnant women should always consult their physician before using any type of allergy medication. While some allergy medications are considered safe, others may pose a risk to the fetus. If a pregnancy is being planned, it is best to ask about medications prior to becoming pregnant.

Breastfeeding mothers also should contact their physicians before taking allergy medications. While many allergy drugs are not passed through breastmilk in significant amounts, the effects of others are unknown. In addition, some allergy medications can lower the amount of milk produced by the mother.