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Probably, Yes. Benadryl is an antihistamine medicine that may not be suitable for some dogs. As a result, it can show some adverse reactions including constipation, allergies, vomiting, nausea, upset stomach, etc.

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Aside from its antihistamine effects, Benadryl can also affect the dog’s salivary glands, making the dog’s mouth dry and painful. This can lead to dehydration, which can make eating difficult and cause discomfort. 


Although this condition is treatable, it can be quite uncomfortable for your dog. Read on to learn more about Benadryl and constipation in dogs.


Why Does Benadryl Cause Constipation in Dogs?


It’s not uncommon for some Benadryl products to cause constipation in dogs. Benadryl contains the active ingredient, Diphenhydramine, which is not suitable for some canines.


These ingredients may cause constipation, liver damage, increased heart rate, and even a temporary increase in blood pressure. It’s important to check with your vet before giving Benadryl to your dog, as some can have severe side effects.

It’s important to know that Benadryl for dogs is the same medication that’s used to treat human allergies. In humans, it’s a common choice for treating a variety of ailments, from allergy to motion sickness. 


Benadryl is a safe and effective treatment for these conditions, and it’s widely recommended by veterinarians. However, despite its many benefits, Benadryl can cause constipation in dogs.

What Does Benadryl Treat in Dogs?


Benadryl is a common over-the-counter medication used to help pets manage allergic reactions. The drug reduces the symptoms of itchiness and swelling and temporarily calms an anxious dog. 


According to Tierra Price, founder of the BlackDVM Network, the medication can also be useful for dogs with motion sickness. The drug acts as a receptor antagonist, blocking histamines.

Benadryl Composition & Dosage


While the active ingredient in Benadryl is diphenhydramine, the dosage for dogs is 1 mg per pound of body weight. A twenty-five-pound dog would receive five milligrams of Benadryl.


Benadryl is also available in children’s formula liquid form. The liquid form is much easier to administer to smaller dogs than tablets. However, adult formula tablets contain alcohol, which is toxic for dogs.

Can Antihistamines Cause Constipation in Dogs?


Antihistamines are often prescribed for the relief of allergies, but can they also cause constipation in dogs? There are several causes of constipation in dogs, including dietary changes, a diet high in fiber, medications, and hormonal disorders


Constipation can also be caused by more serious conditions, including an enlarged prostate, anal gland tumors, enlarged lymph nodes, per-anal hernias, and pelvic fracture, which may narrow the opening of the pelvis and cause pain when urinating.

During constipation, feces move slowly or become harder and smaller to pass. If a dog is experiencing slow or infrequent defecation, call the vet to determine if they are suffering from an underlying condition. 


It’s best to consult a veterinarian if your dog is unable to defecate at all or cannot urinate for any reason. 

The symptoms of constipation can vary wildly from mild to severe. Ultimately, you must seek medical attention for your dog.

Benadryl Side Effects in Dogs


Dogs can experience Benadryl side effects. The active ingredient in Benadryl, diphenhydramine, is an antihistamine. 


In humans, Benadryl is commonly used for allergy relief. It works by blocking the secretion of histamine, a natural substance in the body that helps with local immune responses. Because of its ability to block the release of histamine, it reduces swelling and itchiness.

Although Benadryl is not approved by the FDA for use in dogs, it is often used for allergies and anxiety in pets. Benadryl can cause allergic reactions in dogs, so it is best to use it only as directed by your veterinarian. 


However, be sure to watch for any adverse effects. If you notice any strange effects, call your veterinarian and get more information. In general, however, Benadryl’s side effects in dogs are rare and not harmful for dogs.

How to Cure Constipation in Dogs?


In addition to prescription medications, your veterinarian may be able to offer natural remedies and home remedies for constipation in your dog. 


Depending on your dog’s age and health, you may be able to cure constipation in dogs using a high-fiber diet

This diet will normalize the motility of the intestines and relieve constipation. Your dog will need fiber, so you may want to try adding some bran to their food. 

Metamucil is also a good choice, but only after consulting your veterinarian. Adding plain pumpkin to your dog’s diet can also help.

Treatment of constipation in dogs depends on the cause of the problem. Although it is generally a harmless condition, prolonged constipation can be dangerous for your dog. 


If your dog is unable to defecate for 72 hours or more, it may need veterinary care. 

To help alleviate this condition, try feeding your dog high-fiber dog food and administering probiotic supplements.

Doctor Xeeshan

Doctor Xeeshan

I am Doctor Xeeshan, located in Lahore, Punjab, Pakistan. In this blog, I am providing authentic information about dog breeds, diseases, medications, etc.

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