Is Paxil (Paroxetine) Safe During Pregnancy?

What does the evidence say about paxil during pregnancy?

1. Some studies have linked first-trimester paroxetine exposure to a small increased chance of birth defects, especially heart defects, while other studies found no increased risk, against a baseline heart-defect rate in the general population of about 1 in 100. 1
2. Babies exposed to paroxetine later in pregnancy can show temporary jitteriness, increased muscle tone, irritability, feeding difficulty, or breathing changes after birth, and these effects are usually mild and go away on their own. 2
3. A 2016 systematic review and meta-analysis found first-trimester paroxetine use was associated with a pooled odds ratio of 1.28 for major cardiac malformations, with a roughly doubled risk specifically for atrial septal defects, and the authors tie this evidence base to the FDA's reclassification of paroxetine from pregnancy category C to category D. 3
4. A broader critical review of antidepressant use in pregnancy notes that not every meta-analysis agrees: some found no statistically significant rise in major malformations while others did find a cardiac signal, and the authors conclude any absolute risk increase appears small, especially measured against the pregnancy risks of untreated depression itself. 4
5. Responding to critics of their own meta-analysis, the same research group argues there is biological plausibility behind the cardiac signal, since serotonin reuptake inhibition during the exact window of heart formation could plausibly affect development, and they caution that paroxetine's pregnancy safety should never simply be assumed when a single study fails to reach statistical significance. 5

Is paxil safe in each trimester?

• First trimester. The first trimester is when paroxetine's cardiac signal matters most, since this is the window when a baby's heart is forming. A 2016 systematic review and meta-analysis found a higher rate of major cardiac malformations, particularly atrial septal defects, among infants exposed to paroxetine early in pregnancy, though other individual studies found no increased risk and researchers describe the absolute rise in risk as small against a baseline heart-defect rate of about 1 in 100. This history is the main reason prescribers usually reach for a different SSRI rather than start paroxetine fresh in pregnancy; anyone already taking it should talk with their prescriber before making any change.
• Second trimester. Specific second-trimester data is thin, but paroxetine use anywhere in pregnancy has been linked in some studies to a modestly higher chance of preterm delivery, and untreated depression carries that same risk on its own, which makes the medication's individual contribution hard to isolate. Persistent pulmonary hypertension of the newborn, a rare heart and lung condition, has also been linked to SSRI use in the second half of pregnancy, though the overall chance stays under 1 in 100 births. This stage is a reasonable point to check in with your prescriber about how your mood and symptoms are actually tracking.
• Third trimester. By the third trimester, attention shifts toward how a newborn adjusts right after delivery. Babies exposed to paroxetine late in pregnancy can show temporary jitteriness, increased muscle tone, irritability, feeding difficulty, or breathing changes in the first days of life; MotherToBaby describes these effects as usually mild and something that goes away on its own, though some newborns are watched in a special care nursery as a precaution. Paroxetine also passes into breastmilk in small amounts, which is worth raising with both your prescriber and your baby's pediatrician before delivery.