Which of the following drugs cause diarrhea?
**Core Concept**
Laxatives and medications that affect gut motility, secretion, or absorption can cause diarrhea. This question assesses the student's knowledge of pharmacological agents that alter gastrointestinal function.
**Why the Correct Answer is Right**
The correct answer is likely a medication that increases gut secretion, relaxes intestinal smooth muscle, or inhibits water absorption. Examples include:
* Laxatives like senna and bisacodyl, which stimulate colonic motility and increase water secretion.
* Antacids and H2 blockers, which can increase gastric acid secretion and lead to diarrhea.
* Antimicrobials like penicillin and erythromycin, which can alter gut flora and cause diarrhea.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is unrelated to the topic of causing diarrhea.
**Option B:** This option is incorrect as it is a medication used to treat diarrhea, not cause it.
**Option C:** This option is incorrect as it is a medication used to treat constipation, not cause diarrhea.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that medications can cause diarrhea through various mechanisms, including increased gut secretion, altered gut motility, and changes in gut flora. Students should be aware of the potential side effects of medications on the gastrointestinal system.
**Correct Answer:** C.