Antihistamine · For Dogs · 50 lb
How much Benadryl for a 50 lb dog?
A 50 lb dog (22.7 kg) should receive approximately 45.4 mg of Benadryl per dose, given every 8-12 hours.
This dosage information is for educational purposes only. Always consult your veterinarian before giving any medication to your pet. Dosages may vary based on your pet's health conditions, other medications, and individual factors.
Content reviewed by licensed veterinarians. Sourced from Plumb's Veterinary Drug Handbook and the Merck Veterinary Manual.
Dosage · 50 lb dog
Benadryl dose for a 50 lb dog
Low Dose
22.7
mg
Standard
45.4
mg
Max Safe
90.7
mg
Frequency
every 8-12 hours
Weight in kg
22.7 kg
Always confirm with your veterinarian before administering medication. These calculations are estimates based on published veterinary pharmacology references.
Other Weights
Benadryl for a different size dog
FAQ · 50 lb dog
Questions about Benadryl for a 50 lb dog
How much Benadryl for a 50 lb dog?
What is the safe dose range of Benadryl for a 50 lb dog?
How often can I give Benadryl to a 50 lb dog?
Need a different weight?
Use the calculator on the main Benadryl page for any exact weight, or read the full dosage chart and safety information.
Full Benadryl dosage guide →Sources · 09
Sources & references
The dosage information on this page is compiled from the following veterinary and pharmaceutical references:
- Plumb's Veterinary Drug Handbook — the standard veterinary pharmacology reference used by veterinarians worldwide.
- Merck Veterinary Manual — a trusted, peer-reviewed resource for veterinary professionals and pet owners.
- DailyMed (FDA Drug Labels) — official FDA-approved drug labeling and prescribing information for Diphenhydramine.
Read more about our methodology and how we calculate dosages.