Allegra M contains two active ingredients: fexofenadine and montelukast. While both are generally considered relatively safe, we usually prefer to minimize combination medications during pregnancy. Fexofenadine and montelukast are not known to cause harm to your baby, but it is always best to use the minimum medication necessary. I highly recommend speaking with your OB/GYN. They can help you decide whether to continue Allegra M or switch to a preferred, single-ingredient allergy option while you are trying to conceive and throughout your pregnancy.
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Is it safe to take my allergy and sinus medication, Allegra M, while trying to get pregnant and during pregnancy, and could it harm my baby?