SYNTHETIC DEMONSTRATION — no real student or patient. Not a medical device.

allergy-asthma

Allergy Medicine Safe During Pregnancy: What to Know

Second-generation antihistamines such as loratadine (Claritin) and cetirizine (Zyrtec) are among the most commonly used allergy medications during pregnancy and have a generally reassuring safety record. No medication is entirely without risk in pregnancy, and your clinician should guide any treatment decision — especially in the first trimester.

Talk to a clinician

Nina Osei, NP — Nurse Practitioner

checkups, refills & skin. Gale can match you with a licensed clinician for a visit.

Find care →

Why does allergy treatment matter during pregnancy?

Nasal allergies affect a meaningful portion of pregnant people, and untreated symptoms can significantly affect sleep, energy, and quality of life. Severely uncontrolled asthma — which is often triggered by allergies — carries its own risks for the pregnancy, so in some cases managing the allergic component is important for maternal and fetal health 1. The goal is to use the lowest effective dose of the safest available option for the shortest necessary time.

Which antihistamines are generally considered safer?

Second-generation antihistamines — loratadine and cetirizine — are the most widely used allergy medications in pregnancy and are generally favored as first-line choices by current guidelines 23. They have accumulated a substantial body of observational safety data over years of clinical use. Neither has been shown to cause birth defects in human studies, though no medication has been rigorously tested in randomized controlled trials during pregnancy for ethical reasons.

First-generation antihistamines (diphenhydramine, chlorpheniramine) are older and cross the blood-brain barrier, causing sedation. Diphenhydramine has some evidence of use in pregnancy, particularly in the first trimester for nausea, but the sedation and potential for accumulation make it less preferable for daily allergy management.

Fexofenadine (Allegra) has fewer human pregnancy data than loratadine or cetirizine, so it is generally considered a second choice if those are not suitable 3.

Always review any medication — including over-the-counter products — with your obstetrics clinician or primary-care clinician before using it during pregnancy.

What about intranasal corticosteroids?

Intranasal corticosteroids (INCs) — sprays such as budesonide, fluticasone, and beclomethasone — are the most effective first-line treatment for allergic rhinitis and are used by many people during pregnancy. Because they are applied directly to the nasal lining, systemic absorption is very low, which is a meaningful safety advantage compared to oral medications 3.

Budesonide has the most pregnancy data among INCs and is often cited as the preferred intranasal steroid during pregnancy; it received FDA pregnancy Category B status based on studies from a Swedish birth registry 3. Other INCs used appropriately do not have evidence of harm, but the data for budesonide are more extensive. Your clinician can help choose the most appropriate option.

What should I avoid?

Oral decongestants — pseudoephedrine (Sudafed) and phenylephrine — constrict blood vessels and have been associated with a possible small increase in certain birth defects in observational studies, particularly in the first trimester. Current guidance recommends avoiding oral decongestants in the first trimester and using them only with clinician guidance thereafter 3.

Combination products (antihistamine plus decongestant) such as Claritin-D or Allegra-D carry the same first-trimester caution for the decongestant component.

Allergen immunotherapy (allergy shots): If you were already receiving allergy shots before pregnancy and are on a maintenance dose, continuation is generally considered safe. Starting a new course of shots during pregnancy is typically not recommended because of the risk of systemic reactions during the dose-escalation phase 3.

Non-medication strategies that help

Allergen avoidance — which carries no medication risk — is especially worth prioritizing during pregnancy: - Saline nasal rinses are safe and can clear allergens and reduce congestion - Keep windows closed on high-pollen days - Encase bedding in allergen-proof covers if dust mites are a trigger - HEPA air purifiers in the bedroom can reduce airborne particles - Nasal strips (physical) can help nighttime breathing without any medication

Common questions

Is there any completely safe allergy medicine in pregnancy?

No medication in pregnancy carries a zero-risk guarantee, because randomized controlled trials are not conducted in pregnant populations for ethical reasons. Loratadine and cetirizine have the most reassuring human observational data among oral antihistamines. Your clinician can help you weigh the risks of untreated symptoms against the risks of medication.

I'm in my first trimester and my allergies are terrible. What can I do right now?

Non-medication strategies — saline rinses, allergen avoidance, nasal strips — are the safest starting point. If symptoms are significantly affecting your sleep or daily function, contact your clinician before taking any antihistamine, even an over-the-counter one, so that the choice is appropriate for your specific situation.

My asthma is triggered by allergies. Is untreated allergy dangerous during pregnancy?

Poorly controlled asthma during pregnancy carries risks including preterm birth and low birth weight, so treating the allergic component of asthma appropriately is generally important. Your clinician can help you make sure your asthma action plan is optimized for pregnancy.

Can I continue my allergy shots while pregnant?

If you are already on maintenance doses of allergen immunotherapy, continuation is generally considered acceptable. However, you should inform your allergist that you are pregnant. Starting a new course of shots during pregnancy is generally not recommended.

Talk to a clinician

Nina Osei, NP — Nurse Practitioner

checkups, refills & skin. Gale can match you with a licensed clinician for a visit.

Find care →

Important safety notes for allergy management in pregnancy

  • —Severe shortness of breath or wheezing — may indicate asthma exacerbation, which needs prompt medical attention in pregnancy
  • —Any allergic reaction with swelling of the face or throat — call 911
  • —Significant worsening of any symptom after starting a new medication

Difficulty breathing or throat swelling during pregnancy requires 911. Anaphylaxis during pregnancy is treated with epinephrine — do not delay emergency care.

This article provides general educational information only. All allergy medication decisions during pregnancy must be made with your obstetrics or primary-care clinician, who can weigh your individual circumstances.

References

  1. 1.Seidman MD, Gurgel RK, Lin SY, Schwartz SR, Baroody FM, Bonner JR, et al. (2015). Clinical Practice Guideline: Allergic Rhinitis. Otolaryngology–Head and Neck Surgery. doi:10.1177/0194599814562166 ✓First-line treatment options for allergic rhinitis including intranasal corticosteroids and antihistamines; immunotherapy during pregnancy guidance
  2. 2.Bousquet J, Schünemann HJ, Togias A, Bachert C, Erhola M, Hellings PW, et al. (2020). Next-generation Allergic Rhinitis and Its Impact on Asthma (ARIA) guidelines for allergic rhinitis based on Grading of Recommendations Assessment, Development and Evaluation (GRADE) and real-world evidence. Journal of Allergy and Clinical Immunology. doi:10.1016/j.jaci.2019.06.049 ✓Role of second-generation antihistamines and intranasal corticosteroids in allergic rhinitis management; preference for non-sedating antihistamines
  3. 3.Pfaller B, Bendien S, Ditisheim A, Eiwegger T (2022). Management of allergic diseases in pregnancy. Allergy. doi:10.1111/all.15063 ✓Safety of second-generation antihistamines (loratadine, cetirizine) and intranasal budesonide during pregnancy; oral decongestant caution in first trimester; immunotherapy continuation guidance

3 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.