Loperamide and Pets
Find out if Loperamide is toxic to dogs and cats.
Think your pet ate something toxic?
Call ASPCA Animal Poison Control Center: (888) 426-4435 or view emergency guide
Loperamide, the active ingredient in the popular human anti-diarrheal Imodium, is not a safe home remedy for pets. While it is sometimes used in dogs under direct veterinary supervision, giving it on your own can be dangerous. The biggest concern is the MDR1 (multi-drug resistance 1) mutation found in many herding breeds, including Collies, Shetland Sheepdogs, Australian Shepherds, and their crosses. In affected dogs, loperamide can cross into the brain and cause profound sedation, loss of coordination, and life-threatening respiratory depression.
Cats are also extremely sensitive to loperamide and should never receive it. Even small amounts can cause severe sedation, CNS depression, vomiting, and breathing problems. Because cats are so susceptible, loperamide is generally considered unsafe for them in any situation.
Pets are most often exposed when well-meaning owners give them human Imodium for diarrhea, or when they chew into bottles of tablets or liquid. Store all medications in a secure cabinet, and never give your pet a human medication without first asking your veterinarian. If diarrhea is severe or lasts more than a day, call your vet instead of treating it yourself.
To prevent accidental poisoning, keep loperamide out of reach, clean up spills immediately, and make sure everyone in the household knows not to share OTC medicines with pets. If exposure occurs, contact your veterinarian or a pet poison control center right away.
Is Loperamide Toxic to Dogs?
Not safe for unsupervised use in dogs. Some dogs tolerate vet-directed doses, but MDR1-mutant/herding breeds are at high risk of sedation, neurotoxicity, and serious CNS/respiratory depression.
Is Loperamide Toxic to Cats?
Cats are very sensitive to loperamide and can develop severe sedation, CNS depression, and respiratory depression. Do not give loperamide to cats.
Active Ingredients
- loperamide hydrochloride
Common Brand Names
- Imodium
- Imodium A-D
- various store-brand anti-diarrheal products
Dosage Form
tablet, capsule, liquid solution
Common Uses
- over-the-counter treatment of diarrhea in humans
Toxic Ingredients
- loperamide
Symptoms to Watch For
- sedation
- lethargy
- vomiting
- constipation
- diarrhea
- weakness
- ataxia
- drooling
- abdominal bloating
- CNS depression
- respiratory depression
- agitation or restlessness
- seizures (rare)
What If My Pet Was Exposed to Loperamide?
If your pet has eaten loperamide or shows any symptoms, contact your veterinarian or a pet poison control center immediately. Do not induce vomiting or give additional doses unless instructed by a professional.
Sources
- ASPCA Animal Poison Control Center
- Pet Poison Helpline
- Veterinary Information Network (VIN) - Loperamide toxicosis
Vet's Note
PetPilot provides general information for educational purposes. While we reference authoritative veterinary organizations, this page has not been individually reviewed by a veterinarian for your specific pet. Individual animals may react differently based on age, weight, breed, health conditions, and amount consumed. Always consult your veterinarian or a poison control center for personalized advice, especially if your pet is ill, injured, pregnant, nursing, or on medication.