Which medication is NOT classified as an antacid?

Loperamide is not classified as an antacid because it is primarily used as an anti-diarrheal medication. Its mechanism of action involves slowing down gut movement, which helps to decrease the frequency of bowel movements and allows for more fluid absorption. In contrast, antacids such as calcium carbonate, magnesium hydroxide, and sodium bicarbonate are used to neutralize stomach acid, providing relief from conditions like heartburn and indigestion.

Understanding the role of each medication helps differentiate between those used for gastrointestinal acid-related issues and those used for other purposes, such as managing diarrhea in the case of loperamide.