Pseudoephedrine
Oral decongestant (Sudafed). Vasoconstrictor concerns — ACOG recommends avoiding in the first trimester and in women with hypertension at any point.
Quick answer
Avoid pseudoephedrine (Sudafed) in the first trimester and in anyone with hypertension. It's a vasoconstrictor that may reduce uterine blood flow. Older studies linked first-trimester exposure to gastroschisis. Use saline rinses and second-gen antihistamines instead.
INCI name
Pseudoephedrine
CAS number
90-82-4
Also known as
Sudafed, pseudoephedrine hydrochloride, d-pseudoephedrine
Formula
C10H15NO
What is Pseudoephedrine?
What pseudoephedrine is
Pseudoephedrine is a sympathomimetic decongestant that constricts blood vessels in the nasal mucosa, reducing congestion. It’s sold as Sudafed (now behind-the-counter in the U.S. due to its use in methamphetamine synthesis), Allegra-D, Claritin-D, and similar combination cold/allergy products1.
Why pseudoephedrine is avoided in pregnancy
Pseudoephedrine’s vasoconstrictive effect — useful for shrinking swollen nasal blood vessels — is also its pregnancy concern. The same drug constricts blood vessels throughout the body, including potentially the uterine arteries, which could reduce blood flow to the placenta and developing fetus2.
Specific concerns:
- Gastroschisis association. Older case-control studies linked first-trimester pseudoephedrine exposure to an increased risk of gastroschisis (an abdominal wall defect)3. The association is debated and absolute risk is low, but it has shaped clinical guidance.
- Hypertension concern. Pseudoephedrine raises blood pressure. In anyone with pregnancy-induced hypertension or pre-existing hypertension, this is contraindicated.
- Reduced uterine perfusion. Animal studies show reduced uterine artery blood flow with sympathomimetic exposure.
ACOG and most OB references recommend avoiding pseudoephedrine in the first trimester and in anyone with hypertension throughout pregnancy. Some references allow second and third trimester use for short-duration, low-dose treatment in low-risk patients — with OB approval4.
What about phenylephrine?
Phenylephrine (Sudafed PE) carries similar vasoconstrictor concerns and is also flagged. Many cold and decongestant products switched from pseudoephedrine to phenylephrine after pseudoephedrine moved behind the counter — but for pregnancy, neither is a clear safe choice.
Safer congestion alternatives during pregnancy
- Saline nasal rinse (neti pot, NeilMed, saline spray). First-line for pregnancy congestion. No systemic effects.
- Humidifier and steam. Reduces dry-air contribution to congestion.
- Nasal strips (Breathe Right). Mechanical opening; no drug exposure.
- Elevated head while sleeping. Gravity reduces overnight congestion.
- Second-generation oral antihistamines (loratadine, cetirizine) for allergy-driven congestion. See [Loratadine page](/ingredients/loratadine/).
- Nasal steroid sprays (fluticasone, mometasone) for allergy-driven congestion if antihistamines insufficient — with OB approval.
Is Pseudoephedrine safe while breastfeeding?
Pseudoephedrine reduces breast-milk production and is generally avoided during nursing.
When to talk to your OB
If you used a product containing Pseudoephedrine 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. Pseudoephedrine. PubChem. View source →
- Werler MM. (2006). Teratogen update: pseudoephedrine. Birth Defects Research Part A. View source →
- Werler MM, Sheehan JE, Mitchell AA. (2002). Maternal medication use and risks of gastroschisis and small intestinal atresia. American Journal of Epidemiology. View source →
- American College of Obstetricians and Gynecologists. Cold, Flu, and Allergy Treatments During Pregnancy. ACOG Patient Education. View source →