Cat Benadryl Dosage
Calculate safe Benadryl diphenhydramine dosage for your cat by weight. Get the recommended dose in mg, mL for liquid, or tablet count for allergies.
Medical disclaimer: This tool is for informational purposes only and does not constitute veterinary advice. Always consult your veterinarian before giving any medication to your cat. Benadryl (diphenhydramine) dosage varies by cat weight, health condition, and other factors. Do not exceed the recommended dose. Seek emergency veterinary care if your cat shows adverse reactions such as severe lethargy, vomiting, diarrhea, or difficulty breathing.
About This Calculator
The Cat Benadryl Dosage Calculator helps pet owners determine a safe dose of Benadryl (diphenhydramine) for their cats based on body weight. Veterinarians recommend approximately 1 mg of Benadryl per pound of body weight. This calculator converts that into the appropriate amount for tablets (25 mg), chewable tablets (12.5 mg), or liquid (12.5 mg per 5 mL).
The formula used is simple: dose in mg = cat's weight in lb × 1 mg. For liquid Benadryl with 12.5 mg per 5 mL concentration, the dose in mL equals the weight in lb divided by 2.5. Always give Benadryl every 8 to 12 hours, with a maximum of 3 doses per day.
Important: Benadryl is a brand name for diphenhydramine hydrochloride, an antihistamine used to relieve symptoms of allergic reactions in cats including sneezing, itching, coughing, and motion sickness. Always consult your veterinarian before administering any medication. Avoid gel capsules which contain solvents potentially toxic to cats, and ensure diphenhydramine is the only active ingredient in the product.
Frequently Asked Questions
How much Benadryl can I give my cat?
The recommended dosage is 1 mg of Benadryl per pound of body weight. For a 10 lb cat, that is 10 mg. Enter your cat's weight into the calculator to get the precise dose in mg, liquid mL, or tablet form.
Can cats have Benadryl? Is Benadryl safe for cats?
Benadryl (diphenhydramine) is generally safe for cats when given at the correct dosage of 1 mg per pound of body weight. However, you should always consult your veterinarian before giving any medication to your cat. Some cats may be allergic to antihistamines.
How much liquid Benadryl can a cat have?
For liquid Benadryl with 12.5 mg per 5 mL concentration, divide the cat's weight in pounds by 2.5. For example, a 10 lb cat needs 4 mL of liquid Benadryl (10 / 2.5 = 4 mL).
Is 25 mg of Benadryl safe for a cat?
Veterinarians recommend 1 mg of Benadryl per pound of body weight. A 25 mg dose is only safe if your cat weighs 25 pounds (about 11.3 kg), which is uncommon for most cats. A typical 10 lb cat needs only 10 mg or about 1/4th of a 25 mg tablet.
What are the side effects of Benadryl in cats?
Common side effects include sedation, dry mouth, decreased appetite, and decreased urination. More serious side effects include hyperexcitability, nausea, vomiting, and diarrhea. Contact your veterinarian if your cat shows adverse reactions.
How often can I give my cat Benadryl?
Benadryl can be given every 8 to 12 hours, with a maximum of 3 doses per day. Do not exceed the recommended dosage based on your cat's weight.
Can I give my cat liquid Benadryl?
Yes, liquid Benadryl is safe for cats. Use the liquid concentration of 12.5 mg per 5 mL. Avoid gel capsules as they contain solvents that may be toxic to cats. Always check that diphenhydramine is the only active ingredient.
What is Benadryl used for in cats?
Benadryl is used to relieve allergic reactions in cats including sneezing, itching, coughing, and wheezing. It may also be recommended by veterinarians for anxiety and prevention of motion sickness and nausea during travel.