Benadryl®may make some dogs a little sleepy and less responsive, but it doesn't do anything for their underlying anxiety. Benadryl® does has some efficacy in the prevention of motion sickness in dogs.
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The effects of the medication typically last for around 6-8 hours. Liquid Benadryl is typically recommended for dogs weighing less than 10 pounds, as this can make it easier to achieve an accurate and appropriate dose.
If using Benadryl as a mild sedative for motion sickness or any sort of thunderstorm or travel anxiety, it's best to think ahead so you can plan out when you give it to your doggo. It will usually take 30 minutes for Benadryl to take full effect, and you want your pup calm and anxious-free.
Common side effects of Benadryl include constipation, sedation, urinary retention, diarrhea, vomiting, increased heart rate, and loss of appetite for some dogs. Always be sure to monitor your dog closely when giving medication for the first time.
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).
Benadryl can be highly effective in mitigating issues with environmental allergies. Still, if your dog is struggling with breathing, Benadryl will not be as effective, and you should seek immediate advice from your veterinarian.