Loperamide (Imodium)
⤢ 3D
Antidiarrheal. Reduces intestinal motility. Actively excluded from the brain by P-glycoprotein. No direct brain effect — does not cross the blood–brain barrier.
Benefits
Effective anti-diarrheal that slows gut motility for acute or chronic diarrhea.
Risks
Can cause constipation; massive misuse for opioid-like effects causes dangerous, sometimes fatal, heart arrhythmias. Avoid in bloody diarrhea or suspected bacterial colitis.
Informational only — not medical advice.
Body systems
Organs
Where to buy
Popular Loperamide (Imodium) products on Amazon. Not medical advice — talk to a clinician before starting a supplement.
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Research (5)
- Update on the Epidemiology and Management of Microscopic Colitis Peery et al. (2025) PubMed ↗
- Low anterior resection syndrome Ryoo (2023) PubMed ↗
- Clinical Pharmacology, Toxicity, and Abuse Potential of Opioids Grundmann et al. (2021) PubMed ↗
- Guidelines for the prevention and treatment of travelers' diarrhea: a graded expert panel report Riddle et al. (2017) PubMed ↗
- Recommended guidelines for the treatment of cancer treatment-induced diarrhea Benson et al. (2004) PubMed ↗
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