Comparison · Pregnancy Smart

Best pregnancy-safe allergy medicine

Assigned clinical reviewerMichael Yuzefovich· MD, FACOGDraft · pending clinical reviewUpdated September 18, 2026

How do the options compare?

Options are ordered by how many pregnancies have actually been studied, how much of each one reaches your bloodstream, and whether it carries a trimester-specific caution.

Option	Studied pregnancy dose	Guideline support	Notes
Cetirizine (Zyrtec)	The label dose, confirmed with your provider	Studies involving over 1,300 exposed pregnancies did not show an increased chance of birth defects	Several small studies found no higher chance of miscarriage, and MotherToBaby describes it as less likely to cause drowsiness for a breastfeeding parent and baby than some other antihistamines.
Loratadine (Claritin)	The label dose, confirmed with your provider	Taking loratadine is not expected to increase the chance of birth defects	An early hypospadias signal was not repeated later, and the original researchers put it down to chance or other factors. A study of 163 first-trimester exposures found no increased chance of miscarriage.
Fluticasone nasal spray (Flonase)	Sprayed in the nose rather than swallowed	Not expected to increase the chance of birth defects, whether inhaled, sprayed in the nose, or applied topically	Those routes are absorbed into the body in lower amounts than medication taken by mouth, which is what makes a spray a reasonable add-on.
Pseudoephedrine, the '-D' on Zyrtec-D or Claritin-D	Not recommended for the first 3 months	ACOG does not recommend pseudoephedrine for the first 3 months of pregnancy	Some studies found a small increased chance of gastroschisis, small intestinal atresia, and hemifacial microsomia.

Studies covering more than 1,300 pregnancies found no increased chance of birth defects with cetirizine, and separate research found no higher chance of miscarriage either. 1
Loratadine isn't expected to raise the chance of birth defects, and an early concern linking it to one specific defect wasn't confirmed by later research. 2
Only a small amount of fluticasone reaches your bloodstream when you use it as a nasal spray, and easing significant congestion is usually better than leaving it unaddressed. 3
ACOG advises against pseudoephedrine during the first three months of pregnancy, which includes any combination cold or allergy product with '-D' in its name, since that letter means added pseudoephedrine. 4
First-trimester use of oral decongestants like pseudoephedrine has been linked to a modest increase in a few specific birth defects, an effect researchers tie to how the drug narrows blood vessels. 5

Which option makes sense?

Cetirizine and loratadine carry the most pregnancy data among the oral options, a fluticasone spray adds congestion coverage with less reaching your bloodstream, and the '-D' versions are the ones to leave on the shelf for the first three months.

Disclosure: Pregnancy Smart makes supplements that overlap with some options above. This comparison describes the evidence, not our own product; where our formulation is relevant it is named.

Frequently asked questions

What is the safest allergy medicine to take while pregnant?

Non-drug steps like saline nasal rinses and avoiding triggers are a good first step for mild symptoms. When you need medication, cetirizine, loratadine, and fexofenadine haven't shown an increased chance of birth defects, which is why these second-generation antihistamines are generally favored over older options. Confirm the right choice and dose with your healthcare provider.

Why should I avoid allergy medicines with "-D" in the name during pregnancy?

The '-D' on a product name, like Zyrtec-D or Claritin-D, means it has added pseudoephedrine, a decongestant. ACOG advises against pseudoephedrine in the first three months of pregnancy, and research has found a modest increase in a few specific birth defects with first-trimester use. Ask your provider before using any combination product.

Can I use a steroid nasal spray like Flonase while pregnant?

Yes, fluticasone nasal spray is a reasonable option in pregnancy, since only a small amount reaches your bloodstream when you spray it in your nose. It's often added when an antihistamine alone doesn't fully clear congestion. Check with your provider about which nasal steroid and dose fit you best.

Is Benadryl (diphenhydramine) a better choice than Zyrtec or Claritin for pregnancy allergies?

Not usually. Diphenhydramine is an older, first-generation antihistamine that causes more sedation and dry mouth than cetirizine, loratadine, or fexofenadine. See our diphenhydramine safety card for its full profile. Most clinicians favor a second-generation option for daytime allergy symptoms, with your provider's input.

References

Cetirizine (Zyrtec): MotherToBaby Fact Sheet
MotherToBaby · https://mothertobaby.org/fact-sheets/cetirizine/
Loratadine (Claritin): MotherToBaby Fact Sheet
MotherToBaby · https://mothertobaby.org/fact-sheets/loratadine/
Fluticasone (Flovent/Flonase): MotherToBaby Fact Sheet
MotherToBaby · https://mothertobaby.org/fact-sheets/fluticasone-flovent-flonase/
Pseudoephedrine: MotherToBaby Fact Sheet
MotherToBaby · https://mothertobaby.org/fact-sheets/pseudoephedrine/
Teratogen Update: Pseudoephedrine
PubMed · https://pubmed.ncbi.nlm.nih.gov/16933214/

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.