Naproxen in Pregnancy — Is It Safe?
Last reviewed: · Source: US FDA drug label database
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Avoid naproxen in pregnancy — like all NSAIDs it risks fetal kidney and heart complications, especially from 20 weeks onwards.
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- The FDA specifically warns against NSAIDs like naproxen from 20 weeks of pregnancy onwards.
- It can cause the fetal ductus arteriosus to close prematurely, which can damage the baby's heart, and reduce amniotic fluid levels.
- Naproxen's longer duration of action means its effects on the fetus may persist longer than shorter-acting NSAIDs like ibuprofen.
- Paracetamol is the recommended alternative for pain relief at any stage of pregnancy.
Is it safe to take Naproxen with Pregnancy?
Naproxen carries the same pregnancy risks as ibuprofen. From 20 weeks it can reduce amniotic fluid by affecting fetal kidneys, and in the third trimester it can cause the fetal ductus arteriosus to close prematurely, damaging the baby's heart and lungs. Paracetamol is the recommended painkiller throughout pregnancy. Women using naproxen for period pain should stop once pregnant or trying to conceive.
How do Naproxen and Pregnancy interact?
Naproxen inhibits prostaglandin synthesis. Fetal renal prostaglandins maintain urine output and amniotic fluid (oligohydramnios risk after 20 weeks); ductal prostaglandins keep the ductus arteriosus open (premature constriction risk after 28 weeks). Naproxen's long half-life makes sustained fetal exposure more likely than shorter-acting NSAIDs.
Data sourced from the US Food and Drug Administration (FDA) drug label database: FDA 2020 NSAID warning — avoid from 20 weeks gestation.
Interaction severity
Rated major: naproxen carries the same FDA-flagged NSAID risks as ibuprofen — premature closure of the fetal ductus arteriosus and reduced amniotic fluid — and these are well-documented, serious fetal risks rather than a mild caution, especially from 20 weeks onwards.
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All pregnant women and those trying to conceive. Women who took naproxen before a positive test should mention it to their midwife — very early exposure is lower risk.
What if I've already taken Naproxen and Pregnancy?
A dose taken before you knew you were pregnant is unlikely to cause harm — do not take more, switch to paracetamol, and inform your midwife. If naproxen was taken after 20 weeks, your midwife may arrange a fluid check.
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Frequently Asked Questions
Can I take naproxen while pregnant?
No — avoid it throughout pregnancy, strictly from 20 weeks. Paracetamol is the safe alternative.
I took Feminax before I knew I was pregnant — is my baby OK?
Very early one-off exposure is low risk. Stop now, use paracetamol instead, and mention it at your booking appointment.
What can I take for period-type cramps in early pregnancy?
Paracetamol, warmth, and rest. Cramping with bleeding in pregnancy should always be checked by a midwife or GP.
When after birth can I take naproxen again?
Naproxen is generally compatible with breastfeeding in occasional doses, but check with your midwife or pharmacist first.