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This is an information resource — not medical advice.

PillCodex provides general educational information about medications. This content is not a substitute for professional medical advice, diagnosis, or treatment. Never start, stop, or change a medication based on what you read here. Always speak to your doctor, pharmacist, or qualified healthcare provider with questions about your medications.

🚨 If you are experiencing a medical emergency or think you may have taken too much of a medication, call emergency services (911 in the US) or go to your nearest emergency room immediately.

Antidiarrheal / Opioid Receptor Agonist (Peripheral)✓ Over-the-counter

What Is Loperamide (Imodium) Used For?

Brand names: Imodium, Imodium A-D

Loperamide is an OTC antidiarrheal medication that slows intestinal movement to reduce diarrhea. It works peripherally and does not cross into the brain at normal doses.

What is Loperamide used for?

  • Acute diarrhea (traveller's diarrhea, food-related)
  • Chronic diarrhea associated with inflammatory bowel disease (IBS, Crohn's)
  • Reducing output from ileostomies

How does Loperamide work?

Loperamide activates opioid receptors in the gut wall, slowing intestinal contractions and reducing fluid and electrolyte secretion into the intestine. It doesn't cross the blood-brain barrier at normal doses so has no narcotic effects.

Dosage information

💊Available forms
  • 2mg capsules
  • 2mg tablets
  • 2mg chewable tablets
  • 1mg/5ml liquid
📏Typical dosage

Acute diarrhea: 4mg (2 capsules) at first loose stool, then 2mg after each subsequent loose stool. Maximum 16mg/day (OTC: 8mg/day). Do not use for more than 2 days OTC.

⚠️ Dosage varies by individual. Always follow your doctor's or pharmacist's instructions — never self-dose based on general information.

Side effects

Common

  • Constipation
  • Stomach cramps
  • Nausea
  • Dry mouth
  • Dizziness

⚠️ Serious — contact your doctor

  • Toxic megacolon if used in infectious colitis (bowel distension requiring emergency care)
  • Serious heart rhythm problems at very high doses (abuse doses)
  • Paralytic ileus (bowel obstruction)

Important warnings

⚠️ Do NOT use if you have bloody diarrhea or high fever — may be a serious bacterial infection that needs antibiotics, not slowing down
Do not use in children under 2
Do not exceed recommended doses — high doses can cause dangerous heart rhythm problems
Stop and see a doctor if diarrhea lasts more than 2 days (OTC use)
Do not use in antibiotic-associated diarrhea without medical guidance

Drug interactions

These substances may interact with Loperamide. This is not a complete list — always tell your doctor and pharmacist ALL medications and supplements you take.

Quinidine and ritonavir (significantly increase loperamide levels — cardiac risk)Other opioids (additive effects)

Pregnancy & breastfeeding

🤰 Use with caution in first trimester — generally acceptable in second and third trimester

Always consult your doctor or obstetrician before taking any medication during pregnancy or while breastfeeding.

Frequently asked questions

What is loperamide (Imodium) used for?

Loperamide is used to treat acute diarrhea including traveller's diarrhea and food-related diarrhea. It slows gut movement to reduce frequency and urgency.

When should I NOT take loperamide?

Do not take loperamide if you have bloody diarrhea, fever, or signs of bacterial infection — slowing the gut can keep infectious bacteria inside longer and worsen the infection. Seek medical care instead.

How quickly does loperamide work?

Loperamide typically begins working within 1 hour. Significant relief from acute diarrhea is usually felt within 2–4 hours of the first dose.

Is loperamide safe for children?

Not recommended for children under 2. Children 2–5 should use only the liquid formulation at weight-based doses. Always use children's specific products and dosing instructions.

Can I take loperamide for IBS?

Yes — loperamide is frequently used for diarrhea-predominant IBS (IBS-D) to reduce urgency and frequency. It should be taken at the lowest effective dose, usually before meals or situations likely to trigger diarrhea.

Related medications

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This is an information resource — not medical advice.

PillCodex provides general educational information about medications. This content is not a substitute for professional medical advice, diagnosis, or treatment. Never start, stop, or change a medication based on what you read here. Always speak to your doctor, pharmacist, or qualified healthcare provider with questions about your medications.

🚨 If you are experiencing a medical emergency or think you may have taken too much of a medication, call emergency services (911 in the US) or go to your nearest emergency room immediately.

Information on this page is sourced from general pharmaceutical references and is provided for educational purposes only. Drug information may change — always verify with your pharmacist or prescriber. PillCodex.com is not affiliated with any pharmaceutical company.