Is Nexium safe during pregnancy?

What does the evidence say about Nexium during pregnancy?

1. Esomeprazole and omeprazole share a single pregnancy fact sheet, and the available information does not suggest a higher chance of birth defects with either one. 1
2. Esomeprazole had no published human pregnancy data of its own when the classic 2006 review was written, which is a large part of why the older omeprazole is still the default pick in obstetric practice. 2
3. Across 2.7 million pregnancies, first-trimester proton pump inhibitor exposure carried a relative risk of 1.07 for major congenital malformations, and the effect disappeared entirely when siblings were compared, pointing to confounding rather than the drug. 3
4. A Swedish cohort of 1,089,514 deliveries found proton pump inhibitor users had modestly higher odds of pre-eclampsia (OR 1.19) and preterm birth (OR 1.23), and the authors called for more cautious prescribing, though the design cannot separate the drug from the reflux that prompted it. 4
5. Proton pump inhibitors act on pumps that switch on during a meal, so a dose before food does more than the same dose taken at bedtime. 5

Is Nexium safe in each trimester?

• First trimester. If you took Nexium before you knew you were pregnant, the reassuring news is that the pregnancy data for esomeprazole are pooled with omeprazole and have not shown a higher chance of birth defects. Do not stop abruptly on your own; acid rebound is real, and your provider may simply switch you rather than pull the drug.
• Second trimester. This is when reflux tends to arrive in earnest. Nexium is a reasonable option if antacids and famotidine have stopped covering you, though many obstetric clinicians will step you to omeprazole instead, purely because it is the older molecule with the deeper safety file.
• Third trimester. Symptoms usually peak now. If you are on Nexium at this stage, take it about 30 minutes before your largest meal rather than at bedtime, and mention any new swelling or blood-pressure readings at your visits so the whole picture stays in front of your provider.