What happens when a dog eats Benadryl?
Benadryl, also known as diphenhydramine, is a common over-the-counter medication used to treat allergies and motion sickness in humans. While it is sometimes prescribed for dogs by veterinarians, it's essential to understand the potential risks and consequences of giving your dog Benadryl without proper guidance.
Is Benadryl safe for dogs?
Benadryl is generally considered safe for dogs in small amounts, but overdose can occur. The right dosage for dogs is based on body weight, and it's crucial to consult with a veterinarian before administering Benadryl to your dog. Human medications, including Benadryl, are usually unsafe for dogs due to differences in metabolism and reaction to the medication.
What to do if your dog eats Benadryl

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If you suspect your dog has ingested Benadryl, it's essential to evaluate the situation promptly. Immediate actions are necessary to ensure your pet's safety. Contact your veterinarian, an emergency veterinary clinic, or a pet poison hotline (such as Pet Poison Helpline at 855-764-7661 or ASPCA Animal Poison Control at (888) 426-4435) for guidance.
Symptoms of Benadryl overdose in dogs
- Lethargy
- Sedation
- Dry mouth
- Urinary retention
- Abnormal heart rate
- Abnormal blood pressure
- Vomiting
- Diarrhea
- Seizures
- Respiratory depression
What happens if a dog eats too much Benadryl?

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Accidental overdose can be life-threatening, leading to symptoms ranging from lethargy to seizures. If your dog has ingested a large amount of Benadryl, it's crucial to seek veterinary attention immediately. In severe cases, Benadryl overdose can cause coma, respiratory failure, or even death.
How to use Benadryl safely for dogs
Benadryl should only be used under the guidance of a veterinarian, and it's essential to follow the recommended dosage. A safe dosage for dogs is typically 1 mg per pound of body weight, but this may vary depending on the individual dog and the condition being treated. It's also crucial to monitor your dog closely for signs of adverse reactions and to seek veterinary attention if you notice any unusual behavior or symptoms.
When to avoid giving Benadryl to dogs

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Beyond the risk of overdose, there are certain conditions where giving Benadryl to dogs can be harmful. These include:
- Cardiovascular or lung diseases
- Glaucoma (an eye disease that causes increased pressure in the eye)
- Pregnancy or nursing
- Age-related conditions, such as liver or kidney disease