Diphenhydramine (Benadryl)
Brands: Benadryl, Vetadryl
Diphenhydramine is an antihistamine used for allergies in pets. Consult a vet before use.
Used for
- Allergic reactions
- Motion sickness
- Anxiety
How it is given
- Administration
- oral
- Frequency
- every 8-12 hours
- Duration
- varies based on condition
- Storage
- Store at room temperature, away from moisture and sunlight
- Pregnancy safety
- caution
Always confirm the exact dose with your veterinarian before giving any medicine.
Typical dose ranges
cat
- Standard
- 1 mg/lb, typically 5-10 mg
dog
- Large dogs
- 50 mg
- Small dogs
- 1 mg/lb, not exceeding 25 mg
- Medium dogs
- 25 mg
Ranges are reference only. Your vet sets the dose for your pet's weight and condition.
Active ingredients
- Diphenhydramine
Side effects
Common
- Drowsiness
- Dry mouth
Rare
- Urinary retention
Severe
- Difficulty breathing
Do not use when
- glaucoma
- severe heart disease
Interacts with
- Central nervous system depressants
- Anticholinergic drugs
Warnings
- Avoid in pets with glaucoma
- Caution in pregnant animals
Diphenhydramine (Benadryl) questions
Can I give my pet Benadryl for anxiety?
Yes, but consult your vet for proper dosage.
How quickly does Benadryl work in pets?
It typically starts working within 30 minutes.
Can Benadryl be used long-term?
Only under veterinary supervision.
What should I do if I miss a dose?
Give it as soon as you remember, but skip if it's close to the next dose.
Is Benadryl safe for puppies and kittens?
Use with caution and only under veterinary guidance.
Full drug detail
Overview
Diphenhydramine, commonly known by the brand name Benadryl, is an antihistamine widely used to treat allergic reactions in pets. While it is generally safe, it is essential to consult a veterinarian before administering it to your pet.
How It Works
Diphenhydramine works by blocking histamine receptors, reducing symptoms of allergic reactions such as itching, swelling, and redness.
Uses & Indications
Diphenhydramine is used to treat various conditions in pets, including:
- Allergic reactions
- Motion sickness
- Anxiety
Dosage Guidelines
Dogs
- Small dogs: 1 mg/lb, not exceeding 25 mg
- Medium dogs: 25 mg
- Large dogs: 50 mg
Cats
- Standard: 1 mg/lb, typically ranging from 5-10 mg
Administration
Diphenhydramine is administered orally in tablet or liquid form. Consult your veterinarian for the best form for your pet.
Frequency
The medication is typically given every 8-12 hours, depending on the severity of the condition.
Duration
Treatment duration varies based on the condition being treated and veterinary advice.
Side Effects
Common
- Drowsiness
- Dry mouth
Rare
- Urinary retention
Severe
- Difficulty breathing (seek veterinary attention)
Precautions & Warnings
- Avoid use in pets with glaucoma or severe heart disease.
- Use caution in pregnant or nursing animals.
Drug Interactions
Diphenhydramine may interact with:
- Central nervous system depressants
- Anticholinergic drugs
Storage
Store at room temperature, away from moisture and sunlight.
FAQ
- Can I give my pet Benadryl for anxiety? Yes, but consult your vet for proper dosage.
- How quickly does Benadryl work in pets? It typically starts working within 30 minutes.
- Can Benadryl be used long-term? Only under veterinary supervision.
- What should I do if I miss a dose? Give it as soon as you remember, but skip if it's close to the next dose.
- Is Benadryl safe for puppies and kittens? Use with caution and only under veterinary guidance.