Loratadine
Second-generation antihistamine (Claritin). Preferred non-sedating allergy medication in pregnancy with reassuring safety data.
Quick answer
Loratadine (Claritin) is the preferred non-sedating second-generation antihistamine for pregnancy allergies. Multi-decade safety record with no consistent evidence of teratogenicity. Considered safe across all trimesters by ACOG.
INCI name
Loratadine
CAS number
79794-75-5
Also known as
Claritin, Alavert, desloratadine (active metabolite, sold as Clarinex)
Formula
C22H23ClN2O2
What is Loratadine?
What loratadine is
Loratadine is a second-generation H1 antihistamine that blocks histamine action at peripheral H1 receptors, reducing allergy symptoms (sneezing, itching, runny nose, watery eyes) without significantly crossing the blood-brain barrier. This non-sedating property differentiates it from first-generation antihistamines (diphenhydramine) that cause drowsiness1.
Available OTC as Claritin and store-brand equivalents. Once-daily dosing. The active metabolite desloratadine is also available by prescription (Clarinex).
Why loratadine is pregnancy-preferred
- Large safety dataset. Multiple cohort studies of thousands of pregnancy exposures have found no consistent increase in birth defects compared to controls2.
- Non-sedating. Unlike first-generation antihistamines, loratadine doesn’t impair driving, work, or daily functioning — particularly relevant in pregnancy when fatigue is already common.
- ACOG endorsement. ACOG and the American College of Allergy, Asthma, and Immunology both list loratadine as a preferred antihistamine for pregnancy3.
- Minimal systemic side effects. Low risk of the anticholinergic effects (dry mouth, urinary retention, constipation) common with older antihistamines.
A note on combination products (Claritin-D)
While loratadine itself is pregnancy-safe, the “D” combination products (Claritin-D) contain pseudoephedrine — which is avoided in the first trimester and in patients with hypertension. If your pregnancy congestion needs both antihistamine and decongestant effect, take them as separate medications under OB guidance rather than as a combo4.
Practical pregnancy allergy management
For pregnancy allergies and congestion:
- First-line: Loratadine 10 mg once daily, OR cetirizine 10 mg once daily (Zyrtec)
- Add if needed: Saline nasal rinses, nasal strips
- Add if persistent: Intranasal steroid (fluticasone, budesonide) — OB approval recommended
- Avoid: Pseudoephedrine, phenylephrine (decongestants); first-generation antihistamines for routine use; combination cold/flu products without checking each active ingredient.
Other pregnancy-safe antihistamines
- Cetirizine (Zyrtec) — second-gen, also pregnancy-safe; some patients find it slightly more sedating than loratadine.
- Diphenhydramine (Benadryl) — first-gen, longer pregnancy use history; causes drowsiness; useful for short-term allergy relief, sleep, or nausea.
Is Loratadine safe while breastfeeding?
Loratadine (Claritin) is the preferred non-sedating second-generation antihistamine for pregnancy allergies. Multi-decade safety record with no consistent evidence of teratogenicity. Considered safe across all trimesters by ACOG.
When to talk to your OB
If you used a product containing Loratadine before learning you were pregnant, mention it at your next prenatal visit — but most topical cosmetic exposures are not a cause for panic. For prescription exposures or specific concerns, contact your OB or midwife directly.
Sources
- U.S. National Library of Medicine. Loratadine. PubChem. View source →
- Schwarz EB, Moretti ME, Nayak S, Koren G. (2008). Risk of hypospadias in offspring of women using loratadine during pregnancy: a systematic review and meta-analysis. Drug Safety. View source →
- American College of Obstetricians and Gynecologists. Asthma and Pregnancy. ACOG Practice Bulletin. View source →
- Werler MM. (2006). Teratogen update: pseudoephedrine. Birth Defects Research Part A. View source →