Antihistamines (Diphenhydramine)
Brands: Benadryl, Vetadryl
Diphenhydramine is an antihistamine used in pets to relieve allergy symptoms.
Used for
- allergic reactions
- motion sickness
- insect bites
How it is given
- Administration
- oral
- Frequency
- every 8-12 hours
- Duration
- varies by condition
- Storage
- store in a cool, dry place
- Pregnancy safety
- caution
Always confirm the exact dose with your veterinarian before giving any medicine.
Typical dose ranges
cat
- Standard
- 1 mg per 1 lb
dog
- Large dogs
- 25 mg per 50 lbs
- Small dogs
- 5 mg per 10 lbs
- Medium dogs
- 10 mg per 20 lbs
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
- diarrhea
Severe
- rapid heartbeat
Do not use when
- glaucoma
- high blood pressure
- urinary retention
Interacts with
- central nervous system depressants
- anticholinergic drugs
Warnings
- avoid in pets with glaucoma
- use caution in elderly animals
Antihistamines (Diphenhydramine) questions
Can I give my pet Diphenhydramine for anxiety?
Consult your vet for the best treatment for anxiety.
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.
Can it be used for snake bites?
Yes, but seek immediate vet care.
Is Diphenhydramine safe for pregnant pets?
Use with caution; consult your vet.
How quickly does it work?
Effects usually begin within 30 minutes.
Full drug detail
Overview
Diphenhydramine, commonly known by the brand name Benadryl, is an antihistamine frequently used in veterinary medicine to alleviate allergy symptoms in pets, such as itching, swelling, and other allergic reactions.
How It Works
Diphenhydramine works by blocking the H1 receptors, preventing histamine from causing allergic symptoms. This reduces inflammation and helps alleviate allergy-related discomfort.
Uses & Indications
Diphenhydramine is used for:
- Relieving allergic reactions
- Managing motion sickness
- Sedation
- Treating insect bites
Dosage Guidelines
Consult a veterinarian for precise dosage. General guidelines include:
- Dogs:
- Small: 5 mg per 10 lbs
- Medium: 10 mg per 20 lbs
- Large: 25 mg per 50 lbs
- Cats:
- Standard: 1 mg per 1 lb
Administration
Diphenhydramine is administered orally, usually in tablet or liquid form.
Frequency
Typically given every 8-12 hours as needed.
Duration
Duration depends on the condition being treated and veterinarian's advice.
Side Effects
Common
- Drowsiness
- Dry mouth
Rare
- Diarrhea
Severe
- Rapid heartbeat
Precautions & Warnings
- Avoid in pets with glaucoma, high blood pressure, or urinary retention.
- Use caution in elderly animals.
Drug Interactions
- Central nervous system depressants
- Anticholinergic drugs
Storage
Store in a cool, dry place away from direct sunlight.
FAQ
- Can I give my pet Diphenhydramine for anxiety? Consult your vet for the best treatment for anxiety.
- 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.
- Can it be used for snake bites? Yes, but seek immediate vet care.
- Is Diphenhydramine safe for pregnant pets? Use with caution; consult your vet.
- How quickly does it work? Effects usually begin within 30 minutes.
Drug Interactions
Interactions may occur with other medications, so inform your vet of all drugs your pet is taking.
Storage
Store at room temperature away from moisture and heat.