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Author: Aaron Lessen M.D. Educational Pearls: Imodium (loperamide) is a mu-opioid receptor agonist. Traditionally, it is used as an anti-diarrheal. It is also abused recreationally for an opioid high and to self-treat opioid withdrawal. 40 or more pills are often ingested. People often co-ingest with cimetidine to potentiate the desired effects. Patients will present with opioid overdose symptoms (narrow pupils, respiratory depression). Narcan is effective in reversing an overdose of Imodium. Imodium prolongs QT and predisposes to Torsades, so monitor rhythm and then treat like any other opioid OD. References: http://www.tandfonline.com/doi/abs/10.3109/15563650.2016.1159310