Is Paracetamol safe during pregnancy?

The short answer: Yes — paracetamol is the preferred analgesic and antipyretic during pregnancy at standard doses and for short courses

Paracetamol (acetaminophen) has the longest safety record and strongest evidence base of any analgesic used in pregnancy. It crosses the placenta but has not been consistently associated with increased risk of major birth defects across millions of exposures. Under the former FDA category system it was Category B. ACOG, NICE, and WHO all recommend it as the first-choice agent for pain and fever during pregnancy.

Dosing

• Standard: 500–1,000 mg every 4–6 hours as needed
• Max in 24 hours: 4,000 mg (4 g)
• Preferred pattern: lowest effective dose for shortest duration

By trimester

• First trimester (weeks 1–12): safe for short courses at standard doses. Large cohort studies (hundreds of thousands of exposures) have not shown consistent teratogenic signals.
• Second trimester (13–27): safe; often used for musculoskeletal pain, headaches, dental procedures.
• Third trimester (28–40): safe; crosses the placenta but unlike NSAIDs does not affect the ductus arteriosus.

Recent research context

Observational studies have raised questions about long-term prenatal paracetamol exposure and possible small associations with neurodevelopmental and reproductive outcomes (ADHD, autism, undescended testes). Findings are inconsistent, cannot establish causation, and are confounded by the reasons women take paracetamol (fever itself affects fetal development). Regulatory agencies have reviewed the evidence and continue to recommend paracetamol as the preferred pregnancy analgesic, advising the minimum effective dose for the shortest necessary duration.

What to avoid in pregnancy (for comparison)