- Use only products that contain diphenhydramine as a single active ingredient. Any other ingredients (eg, painrelievers, decongestants) found in human-label combination products can be toxic to animals.
- Antihistamines should be used on a regular, ongoing basis in animals that respond to them. They work better if used before exposure to an allergen (eg, pollens).
- May cause drowsiness (sleepiness); this effect may lessen with time.
- Rarely, cats may become excited when given this medication.
- May be given either with or without food. If your animal vomits or acts sick after receiving the medication on an empty stomach, try giving the next dose with food or a small treat. If vomiting continues, contact your veterinarian.*
*Plumb DC. Diphenhydramine. Plumb’s Veterinary Drugs https://app.plumbs.com/drug-monograph/tDYQtMqVRGPROD?source=search&searchQuery=diphenhydramine Updated Sept 2020. Accessed January 28, 2022.