Is loperamide safe during pregnancy?

What does the evidence say about loperamide during pregnancy?

1. A controlled study following pregnant women who took loperamide for diarrhea found no higher rate of major birth defects compared with women who didn't take it. 1
2. A larger Swedish birth-registry study found a modestly higher chance of certain birth differences, including a genital difference in baby boys called hypospadias, tied to loperamide use early in pregnancy. 2
3. The official Imodium label advises using loperamide in pregnancy only if the benefit clearly outweighs the risk, since well-controlled studies in pregnant women haven't been done. 3
4. Loperamide is one of the standard over-the-counter options CDC lists for easing diarrhea symptoms, alongside staying hydrated. 4
5. CDC guidance specifically tells pregnant travelers to skip bismuth subsalicylate, the ingredient in Pepto-Bismol and Kaopectate, a reminder that not every diarrhea remedy gets the same green light in pregnancy. 5

Is loperamide safe in each trimester?

• First trimester. The first trimester is where the research is most mixed: one large registry study linked early loperamide use to a modestly higher chance of certain birth differences, while a separate study found no increase in major malformations. Because of that mixed signal, most providers want you to start with fluids and diet changes and check in before taking loperamide this early.
• Second trimester. By the second trimester, short-term loperamide use hasn't shown the same red flags seen with early-pregnancy exposure in the research. Diarrhea that drags on for more than a day or two still deserves a call to your provider, since dehydration on its own can trigger contractions or dizziness.
• Third trimester. Later in pregnancy, brief loperamide use for a specific bout of diarrhea is generally viewed the same way it is in the second trimester: reasonable short-term relief once you've tried fluids and simple foods first. Flag diarrhea that lasts beyond a day or two to your provider right away, since dehydration this late can be harder on both you and the baby.