Which product should pregnant women avoid for heartburn and acid reflux?

Pregnant women should avoid bismuth subsalicylate for heartburn and acid reflux due to its salicylate content, which is similar to aspirin. The use of aspirin during pregnancy, especially in the third trimester, is linked to potential risks such as prolonged labor and hemorrhage. Additionally, salicylates can cross the placenta and may affect fetal development or lead to complications, making it a substance that is best avoided during pregnancy.

In contrast, other options listed, such as calcium carbonate, aluminum hydroxide, and magnesium hydroxide, are commonly used for treating heartburn and acid reflux and are generally considered safe for use during pregnancy. These antacids neutralize stomach acid without the associated risks of bismuth subsalicylate, confirming the rationale behind recommending them over bismuth subsalicylate for pregnant women.