Animals & Pets
Cephalexin for Cats Dosage Calculator
Calculate the appropriate Cephalexin dosage for your cat based on their weight and specific condition. Get accurate antibiotic dosing recommendations for treating bacterial infections in cats.
Reviewed by the calculator.uk.com Team · Last reviewed 29 July 2026 · Our methodology
Enter your cat's weight and infection severity to calculate the recommended Cephalexin dosage.
Related to Cephalexin for Cats Dosage Calculator
The Cephalexin Dosage Calculator for cats determines the appropriate antibiotic dose based on your cat's weight and the severity of the infection. Cephalexin is a first-generation cephalosporin antibiotic commonly prescribed to treat bacterial infections in cats. The calculator uses established veterinary dosing guidelines to provide accurate dosage recommendations.
Dosage Calculation Method
For mild infections, the recommended dosage is 10-15 mg/kg every 12 hours. For severe infections, the dosage increases to 20-30 mg/kg every 8-12 hours. The calculator uses the average of these ranges and adjusts the frequency based on severity to provide optimal therapeutic coverage while minimizing side effects.
Treatment Duration
The typical treatment duration ranges from 7 to 14 days, depending on the infection type and severity. It's crucial to complete the entire prescribed course of antibiotics, even if your cat shows improvement, to prevent antibiotic resistance and ensure complete resolution of the infection.
The calculator provides three key pieces of information: the total daily dosage, the amount per administration, and the recommended treatment duration. Understanding these results is crucial for proper medication administration and treatment success.
Daily Dosage
This is the total amount of Cephalexin your cat should receive over 24 hours. The daily dose is divided into multiple administrations to maintain consistent antibiotic levels in your cat's system.
Per Administration Dose
This shows how much medication to give each time. For mild infections, this amount is given every 12 hours (twice daily). For severe infections, it's typically given every 8 hours (three times daily) to maintain higher antibiotic levels.
Always consult with your veterinarian before starting any antibiotic treatment. The calculator's results are guidelines based on standard dosing protocols, but your vet may adjust the dosage based on your cat's specific condition, medical history, and other factors.
1. Can I adjust the dosage if my cat shows side effects?
Never adjust the antibiotic dosage without consulting your veterinarian. If your cat experiences side effects such as vomiting, diarrhea, or loss of appetite, contact your vet immediately. They can evaluate whether the dosage needs adjustment or if a different antibiotic would be more appropriate.
2. What if I miss a dose?
If you miss a dose, give it as soon as you remember. However, if it's almost time for the next scheduled dose, skip the missed dose and continue with the regular schedule. Never give a double dose to make up for a missed one, as this could increase the risk of side effects.
3. Should I give Cephalexin with food?
Yes, Cephalexin is typically given with food to reduce the likelihood of gastrointestinal upset. This can help improve absorption and minimize potential stomach issues. Ensure your cat has access to fresh water throughout the treatment period.
4. How long does it take to see improvement?
Most cats begin showing improvement within 24-48 hours of starting Cephalexin treatment. However, it's crucial to complete the entire prescribed course of antibiotics, even if your cat appears to be better. Stopping treatment early can lead to antibiotic resistance and recurrence of the infection.
5. What is the scientific source for this calculator?
Cephalexin dosing by body weight follows conventions used throughout small-animal veterinary practice, with Plumb's Veterinary Drug Handbook serving as the reference most vets and pharmacists consult for standard dosage ranges. The mild-versus-severe infection tiers used here reflect the general pattern of weight-based, severity-adjusted antibiotic dosing taught in veterinary pharmacology courses. Actual prescribing should always come from a veterinarian who has examined the cat, since the appropriate dose and treatment length depend on the specific infection being treated.