Loperamide (Imodium) is classified as what type of medication?

• A. Antibiotic
• B. Antidiarrheal
• C. Analgesic
• D. Antiemetic

Answer: (B)

Loperamide is classified as an antidiarrheal because its main job is to stop diarrhea by slowing the movement of the gut. It works by binding to mu-opioid receptors in the intestinal wall, which reduces peristalsis and allows more water to be absorbed, leading to firmer stools and fewer bowel movements. This effect is largely local to the gut, so it relieves diarrhea without producing the systemic opioid effects you’d see with stronger pain medicines. It’s not an antibiotic, so it doesn’t treat infection; it isn’t an analgesic, and it isn’t an antiemetic, so it won’t directly relieve pain from other causes or prevent nausea and vomiting. Use with caution in infectious diarrhea—especially when fever or blood in the stool is present—and seek care if symptoms persist or worsen.