Question 1

What do medical sources say about Buspirone (BuSpar) during pregnancy?

Accepted Answer

1st Trimester: MotherToBaby says it is not known whether buspirone changes the chance of birth defects. A prospective registry report found no major malformations among 72 infants exposed in the first trimester, but this small study cannot settle the risk. The BuSpar product label says controlled human pregnancy studies have not been done and use should be limited to cases where clearly needed. UK product information advises avoiding buspirone as a precaution, while the EMA's 2025 buspirone review record lists the outcome as Maintenance. Ask your provider about your situation. 2nd Trimester: MotherToBaby says studies have not examined whether buspirone raises the chance of preterm delivery or low birth weight. A 2022 registry report found no major malformations among 72 infants exposed in the first trimester, but it does not answer later-trimester questions. The BuSpar product label says controlled human pregnancy studies have not been done and use should be limited to cases where clearly needed. UK product information advises avoiding buspirone as a precaution, while the EMA's 2025 buspirone review record lists the outcome as Maintenance. Ask your provider about your situation. 3rd Trimester: MotherToBaby describes one newborn with poor growth, tremors, low muscle tone, low blood sugar, and feeding trouble after exposure to buspirone, other medicines, and cigarette smoke during pregnancy. The 2021 case report describes several medicines taken together, so it cannot show that buspirone caused the symptoms. The BuSpar product label says controlled human pregnancy studies have not been done and use should be limited to cases where clearly needed. UK product information advises avoiding buspirone as a precaution, while the EMA's 2025 buspirone review record lists the outcome as Maintenance. Ask your provider about your situation.

Question 2

What do medical sources say about Buspirone (BuSpar) while breastfeeding?

Accepted Answer

LactMed says limited data suggest doses up to 45 mg a day produce low levels in milk, but long-term use data are missing and another medicine may be preferred for a newborn or preterm infant. In a 2024 study of nine mothers, buspirone was below detection in all milk samples, its active metabolite was found at low levels, and no infant adverse effects were reported. MotherToBaby and LactMed describe a 3-week-old with seizure-like activity while the mother took buspirone, fluoxetine, and carbamazepine; if a medicine caused it, the case authors thought fluoxetine was more likely. The BuSpar product label advises avoiding breastfeeding use if clinically possible, while MotherToBaby says treatment benefits may outweigh possible risks. The EMA's 2025 review recorded a maintenance outcome. Ask your provider about your situation.

Question 3

Where do sources disagree on Buspirone (BuSpar) in pregnancy or breastfeeding?

Accepted Answer

Different product-label advice for buspirone during pregnancy The UK product information says, 'As a precautionary measure, it is preferable to avoid the use of buspirone during pregnancy.' The US BuSpar product label says use during pregnancy only if clearly needed. MotherToBaby says the effect on birth-defect risk is unknown, and Freeman et al. reported no malformations among 72 first-trimester-exposed infants. The product labels use different caution levels while both describe limited human pregnancy data. The US label is dated 2016, while the UK product information was updated in October 2026. The small first-trimester case series does not settle risk, and the difference in label wording is not evidence of an established harm. The available human pregnancy data remain limited. The first-trimester series observed no malformations, but its small sample cannot rule out an increase. The label difference is a real precaution disagreement; guidance is retained rather than an avoid rating based only on limited data.

Buspirone

Buspirone — Breastfeeding

What the research shows

What's in it / what was tested

Sources disagree

Options sources describe

Beyond pregnancy

All sources