Is Pepcid safe during pregnancy?

What does the evidence say about Pepcid during pregnancy?

1. Studies of famotidine use in pregnancy haven't found a higher chance of birth defects above the general background rate of about 3 percent. 1
2. A 2024 study of 330 women who used famotidine in the first trimester found birth-defect rates close to unexposed women, 3.9 percent versus 2.8 percent, and that small gap disappeared once other factors were accounted for. 2
3. The standard approach to pregnancy reflux starts with lifestyle changes and antacids first, saving H2 blockers like famotidine for symptoms that don't settle down with that first step. 3
4. Famotidine passes into breast milk only in small amounts, and taking it while breastfeeding isn't expected to cause problems for a nursing baby. 1
5. Ranitidine (Zantac) was pulled from pharmacy shelves because its own molecule can form NDMA, a possible carcinogen, when it reacts with nitrites in an acidic stomach, the specific chemical issue behind the recall. 4

Is Pepcid safe in each trimester?

• First trimester. Heartburn is less common in the first trimester, when nausea tends to take center stage, so clinicians usually start with diet changes and a calcium or magnesium antacid before adding famotidine. If reflux is bad enough this early to need an H2 blocker, the same safety data applies no matter which trimester you're in.
• Second trimester. Reflux usually becomes more noticeable in the second trimester as your growing uterus puts pressure on your stomach, which is often when famotidine gets added as the step up from antacids alone. The 2024 study described below didn't find any second-trimester-specific signal for birth defects.
• Third trimester. Heartburn usually peaks in the third trimester, and famotidine is commonly continued through the final weeks when it's keeping symptoms under control. None of the studies here found a specific third-trimester or preterm-birth risk tied to famotidine, but check your medication plan with your delivering clinician as you get closer to labor.