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Loperamide is an FDA-approved synthetic phenylpiperidine opioid with high lipophilicity and is a medication used to treat various forms of diarrhea. Recognized and approved by the FDA, loperamide is an effective intervention for conditions such as traveler's diarrhea, irritable bowel syndrome associated with chronic diarrhea, and acute nonspecific diarrhea in patients older than 2. Loperamide is also indicated for conditions requiring reducing ileostomy output to manage diverse gastrointestinal challenges. However, this medication requires careful consideration due to its potential for misuse, with reports indicating a concerning increase in morbidity and mortality associated with high doses. This activity explores loperamide's indications, contraindications, activities, and adverse events, focusing on the essential elements crucial for members of an interprofessional healthcare team involved in managing patients facing toxicity and its related conditions. As the misuse of loperamide gains prevalence, this activity discusses the complexities surrounding its abuse, providing crucial insights for healthcare professionals. Understanding the risks and nuances associated with loperamide is paramount, ensuring a comprehensive approach to patient care that addresses potential complications and sequelae. Objectives: Identify appropriate patient candidates for loperamide therapy based on medical history and the presence of diarrhea. Screen patients for potential contraindications, drug interactions, and risk factors for loperamide misuse to ensure safe and appropriate use. Apply evidence-based guidelines and best practices for using loperamide in different clinical scenarios, such as chemotherapy-induced diarrhea or non-medical use. Communicate the risks and benefits of loperamide therapy to patients, ensuring they understand the proper use and potential adverse effects. Access free multiple choice questions on this topic.

When loperamide is taken in large doses or with other drugs that may alter its pharmacokinetic effects, such as p-glycoprotein inhibitors, loperamide produces opioid-like symptoms. These include a sensation of euphoria, miosis, central nervous system depression, and respiratory depression. Treatment of loperamide overdose and toxicity is primarily supportive. Naloxone, including an intranasal naloxone bolus, intravenous naloxone bolus, or naloxone infusion, may be used in patients with respiratory depression.[30] As naloxone has a shorter half-life than loperamide, patients should be observed for at least 24 hours after the last naloxone administration to ensure they do not deteriorate clinically. In large quantities, loperamide can cause systemic effects similar to opioid toxicity (central nervous system depression, respiratory depression) and lethal cardiac conduction abnormalities.[3] The patient should be on a cardiac monitor, and an ECG should be obtained. If QRS widening is present, sodium bicarbonate may be given and repeated in boluses or as an infusion.[31] If the patient exhibits signs of QTc prolongation (QTc is considered prolonged if greater than 450 ms in males and 470 ms in females), electrolyte abnormalities (magnesium, potassium, phosphate) should be corrected, and isoproterenol or transcutaneous pacing may be an option.[32] Cardiac arrest is manageable using standard ACLS protocols.

Healthcare providers widely prescribe loperamide for different types of diarrhea. Even though loperamide is available as an over-the-counter medication, its use still requires the attention and oversight of an interprofessional healthcare team. Pharmacists and clinicians should check the potential for abuse and educate the patient about its potential toxicity in higher than recommended doses. Nurses can also provide monitoring and counseling in this area. In September 2019, the FDA approved new package size limitations and unit-dose packaging for certain over-the-counter loperamide products to improve patient safety. When prescribing or recommending loperamide, the nurse and pharmacist should reiterate all safety and dosing issues to ensure proper medication use and optimize patient safety, as patients may think loperamide has no potential for misuse due to its OTC availability. In an overdose, an emergency medicine clinician should rapidly stabilize the patient. A toxicologist consult is necessary for a complicated overdose. An interprofessional team approach and open communication between physicians, advanced practice practitioners, nurses, pharmacists, toxicologists, and specialists can achieve optimal patient outcomes with fewer adverse effects.