One of the most common side effects of Benadryl is sedation. You may notice that your dog gets a bit drowsy after taking Benadryl. If you believe your dog needs help sleeping, you must talk to your veterinarian first. Make sure it is the best option for your dog before you start giving it to him or her.
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Common side effects associated with using Benadryl for dogs include:
Yes, Benadryl is an antihistamine that causes drowsiness in most people. Some people use Benadryl for this side effect if they have trouble sleeping (insomnia), but this is not recommended long-term. The drowsy or sedation effect typically lasts about 8 hours, but may persist into the next day if taken at night.
Mild sedation: Benadryl can have a mild sedative effect on dogs, which can help reduce anxiety or promote relaxation. Prevention of acute allergic reactions: In some cases, Benadryl may help prevent or manage acute allergic reactions, such as those that can occur after a bee sting or exposure to an allergen.
In living animals, hyperactivity, depression, hypersalivation, tachypnea, and tachycardia are the most common signs reported with ethanolamine-based antihistamines, usually occurring within 1 h of exposure (10). With overdose, dogs may also exhibit mydriasis, dry mucous membranes, disorientation, and fever (10).