In cases of suspected bacterial infection, OTC loperamide should be avoided.

• A. It can be used without precautions.
• B. It should be avoided; seek medical care if diarrhea persists or dehydration or suspected bacterial infection.
• C. It is the preferred treatment.
• D. It prevents dehydration.

Answer: (B)

Slowing intestinal movement with an anti-diarrheal like loperamide can keep bacteria and their toxins in the gut longer, which may worsen a bacterial infection or mask symptoms that signal its severity. Because bacterial diarrhea often needs evaluation, fluids, and sometimes antibiotics, it's safer to avoid loperamide when a bacterial cause is suspected. Seek medical care if diarrhea persists, if dehydration occurs, or if there are signs of bacterial infection (such as high fever, severe abdominal pain, or blood in the stool). Remember, loperamide does not kill bacteria; it only reduces stool frequency, so it won’t help the underlying infection and can risk complications in this context.