Most of us have Benadryl in our medicine cabinet. It is a commonly accessible medication used to treat the symptoms of illnesses like hay fever, motion sickness, and seasonal allergies in humans. So, how does Benadryl dosage for dogs work if it works for us?
If you ask around, you’ll discover that many dog owners also give their dogs Benadryl to address a variety of illnesses, including allergy issues, motion sickness, and even nervousness related to fireworks. Benadryl is occasionally given to cats as well.
Below, in the article, we’ll learn about Benadryl dosage for dogs, symptoms, side effects, types of Benadryl, and much more. So, continue reading to know more!
What is Benadryl Used For in Dogs?
We can give Benadryl dosage for dogs for the following:
- Allergies: Diphenhydramine, also known as Benadryl, is a medication used to treat allergies. It is an antihistamine used to treat symptoms like itching, rashes, and dog eye allergies that environmental or seasonal allergens can bring on.
- Anxiety: Benadryl has calming effects that can help dogs stay calm in high-stress circumstances (i.e., fireworks, thunderstorms).
- Insomnia: Benadryl might help your dog feel sleepy and promote sleep if they have difficulties falling asleep.
Although some forms of Benadryl are considered relatively safe for dogs and cats, Benadryl is not FDA approved for animal use. This is even though it is FDA approved for human use.
Types of Benadryl For Dogs

- Liquid: Benadryl is obtainable in liquid form, but because it includes alcohol, you shouldn’t offer it to your dog.
- Tablet: Diphenhydramine 25 mg is the amount found in each Benadryl tablet. You may need to hide the tablet in a tasty treat each time because your dog will probably detest taking the medication. Never administer time-release tablets to dogs because it is difficult to dose them effectively and because dogs absorb tablets differently from humans.
- Spray: Benadryl spray can be applied in an emergency if your dog’s swelling from insect bites or allergic reactions stops him from breathing. However, spraying Benadryl directly onto open or raw wounds might sting, leaving your dog in great discomfort.
Is Benadryl Safe For Dogs?
Dogs can accidentally take too much Benadryl, and the side effects can be deadly. Contact your veterinarian or an emergency veterinary hospital immediately if you have any of these symptoms.
- Abnormal heart rate
- Constipation
- Dilated pupils
- Muscle tremors
- Seizures
- Aggression or agitation
- Dog Breathing Problems
- Extreme drowsiness
- Red eyes
Ironically, some dogs that take Benadryl can develop allergies. You should always keep a close eye on your dog after its initial use, just like any other medicine or drug.
How Long Does Benadryl Take to Work on Dogs?
The effects of Benadryl typically stop acting after 24 hours. Nevertheless, the effects may continue longer in dogs with liver or kidney illness. In particular, if your dog has ongoing liver, kidney, or heart issues, always consult your veterinarian before using Benadryl.
Side Effects Of Benadryl

Dogs can experience the same adverse effects of Benadryl as people. Dry mouth, fatigue, and incontinence are typical side effects.
Rare adverse reactions in some dogs, including diarrhea, vomiting, fast breathing, elevated heart rate, and changes in appetite, are possible. You should contact your veterinarian if these symptoms worsen.
Without first seeing a veterinarian, dogs with the following disorders shouldn’t take Benadryl:
- Allergic lung disease
- Prostatic hypertrophy
- Cardiac conditions
- Glaucoma
- Hypertension
- Low blood pressure
- Seizure disorders
- Bladder neck obstruction
- Pregnant or nursing
- High blood pressure
- Hyperthyroidism
Benadryl Dosage For Dogs
1. Find Out How Many Milligrammes Are There In A Benadryl Pill
Benadryl is available in various doses at various retailers. Benadryl tablets typically contain 25 mg, while some may have a greater or lower dosage. Check the label to find out how much diphenhydramine is in a single Benadryl pill.
- You can buy Benadryl from drugstores, pharmacies, or supermarkets. Further, you don’t need a prescription to get Benadryl because it is available over the counter (for yourself or your dog.)
- Check the ingredients before buying, and make sure that it only contains diphenhydramine. Other formulas will have additional substances that could be harmful to your dog.
2. Give 1 Milligramme For Every Pound Of Body Weight
Giving Benadryl to a dog often follows this general principle. You must know your dog’s weight before giving him the medication because dogs can weigh differently. For instance, if your dog weighs 40 pounds, give him 40 mg of Benadryl.
- Before figuring out the dosage your dog requires, be sure to see your veterinarian.
- You may need to cut Benadryl tablets in half and calculate how many milligrammes are in each piece.
3. Two To Three Times A Day, Provide Benadryl
Give your dog Benadryl every 8 to 12 hours to effectively treat its allergy problems. Observe your dog after giving him his first or second dose of Benadryl; if his symptoms go away, you don’t need to give him another dose.
- The dosages should all be the same size.
4. Give the dog Benadryl before it’s exposed to an allergen
Like most antihistamines, Benadryl functions best as a preventative medicine. Give Benadryl to your dog before exposing it to an allergen if you are aware of the allergy. By doing this, allergic symptoms in your dog will be prevented.
Wrapping Up
So, this was a complete guide on Benadryl dosage for dogs. Be very careful and maintain all the precautions when giving it to your dog to prevent his allergies. Also, giving your dog the correct Benadryl dosage is crucial. Read this article, or you may consult your veterinarian for more information regarding the dosage and all!
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