It’s important to understand a medication’s uses and side effects before giving it to your pet. This medication info sheet is meant to give you a good understanding of what Benadryl (diphenhydramine) is used for, how it works, and potential side effects in cats and dogs. Always consult a veterinarian before giving your pet any medication.
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diphenhydramine
Benadryl
Over-the-counter and prescription
capsule, liquid, injectable, shampoo, topical spray. Multiple strengths are available so be sure to read the label carefully.
Antihistamine
Motion sickness, sedation, anaphylaxis and allergic reactions, atopy, mast cell tumors
Diphenhydramine is a first-generation antihistamine. It competitively inhibits H1 receptors, blocking the action of histamine, a substance in the body that is responsible for allergic symptoms.
Excessive sleepiness, dry mouth, urine retention. May causes excitement, especially in cats.
Can cause excessive sleepiness when use with depressant drugs.
Diphenhydramine is generally safe to use under the direction of a veterinarian. Do not use in pets with glaucoma, hyperthyroidism, hypertension, seizure disorders, heart disease, or in neonates.
How to Give Your Dog Oral Medication
How to Give Your Cat Oral Medication
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