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Pharmacological TherapiesAntidiarrheal → opioid, no CNS

LoperamideNCLEX cheat sheet

Loperamide is an antidiarrheal that slows intestinal motility by acting on opioid receptors in the gut wall, allowing more water reabsorption and firmer stool.

20 key facts 1 practice questions Reviewed Oct 2026
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Uses

  • Acute & chronic diarrhea
  • Slows gut motility → firmer stool

Avoid

  • NO if bloody stool/fever → infection
  • C. diff, ulcerative colitis → megacolon

Report

  • Abd distension, no BM, fever
  • High doses → cardiac arrhythmia

Teach

  • Push fluids → prevent dehydration
Red flag to remember

Report bloody or black stools, high fever, or severe abdominal pain/distension.

Before you read

Test yourself first: 1 question

Question 1 of 1

A client receiving long-term clindamycin therapy develops frequent watery stools. Which is the priority nursing action?

What is loperamide?

It does not cross into the CNS at normal doses, so it does not cause typical opioid effects. It is used for acute and chronic noninfectious diarrhea.

Key points to remember

  • Slows gut motility to reduce stool frequency and fluid loss.
  • Should be avoided in infectious or bloody diarrhea and high fever because slowing motility can trap pathogens and cause toxic megacolon.
  • Avoided in C. difficile and other invasive infections for the same reason.
  • High doses or abuse can cause serious cardiac dysrhythmias and QT prolongation.
  • Can worsen or precipitate ileus and abdominal distension if overused.
  • Watch for dehydration and electrolyte loss from the underlying diarrhea.

Nursing priorities

  1. Assess stool for blood, frequency, and signs of infection before giving.
  2. Monitor hydration status, intake and output, and electrolytes.
  3. Hold and notify the provider if fever, bloody stools, or abdominal distension occur.
  4. Reinforce that the drug controls symptoms but does not treat the cause.
  5. Educate against exceeding the labeled dose because of cardiac risk.

Labs & values

Potassium3.5-5.0 mEq/L
Sodium135-145 mEq/L
3.55.0mEq/L Normal

Patient teaching

  • Stop and call your provider if you see blood in the stool or develop a high fever.
  • Do not take more than the package directs; high doses can harm the heart.
  • Drink oral fluids to replace what was lost from diarrhea.
  • Seek care if diarrhea lasts more than 2 days or worsens.

Red flags: report now

  • Report bloody or black stools, high fever, or severe abdominal pain/distension.
  • Report palpitations or fainting that may signal dysrhythmia from overdose.
  • Never use in suspected infectious diarrhea, C. difficile, or to treat diarrhea longer than 48 hours without improvement.

References

Clinical references for this topic

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