• Category
    Skin and Coat
  • Species
    Canine, Feline
  • Supplied

    Flavored Chewable Tablets
    10 mg/250 ct. 10 mg/30 ct.
    30 mg/250 ct. 30 mg/30 ct.

Vetadryl Is More Cost-Effective Than You May Think And Preferred 7x More Than OTC Diphenhydramine Capsules.


Competitively priced with generic diphenhydramine and less expensive than over-the-counter products, Vetadryl® is a flavored diphenhydramine HCl tablet formulated exclusively for veterinary use, so veterinarians have a pet-friendly formulation for patients needing this well-known antihistamine– right in the clinic.

Vetadryl is manufactured in two strengths, which allows for flexible dosing with both dogs and cats, and is flavor tested; preferred 7x more than diphenhydramine capsules.*

*Data on file

To be used by or on the order of a licensed veterinarian.
  • Detailed Overview
  • Resources

Detailed Overview


For use in animals where antihistamine treatment is indicated.

Dosage and Administration

Dosage guidelines can be viewed on the product label and/or product literature. Dosing directions provided are for guidance only. All PRN® Pharmacal products should be administered under the care and supervision of a veterinary professional to ensure the best possible results.


For oral use only. Use under veterinary supervision. Common side effects may include sedation, ataxia, reduced coordination, gastric upset, thickening of bronchial secretions, and increased urine output. Do not use in patients with known hypersensitivity to diphenhydramine, other antihistamines with similar chemical structure, or any ingredient in the formulation. Use with caution in patients with glaucoma, history of gastric irritation or ulcer, bowel or bladder obstruction, prostatic hypertrophy, active or a history of lower respiratory disease (e.g., bronchial asthma), hyperthyroidism, seizures or cardiovascular disease (e.g., hypertension).


Diphenhydramine HCl, Dibasic Calcium Phosphate Dihydrate, Spray Dried Chicken Liver, Whey, Dry Garlic Flavor, Microcrystalline Cellulose, Dark Brown Lake Blend, Stearic Acid.