Cephalexin for Cats Dosage Calculator

Your details

Enter your cat's current body weight. Doses are calculated per kilogram, so an accurate weight matters.
kg
Your vet's prescribed dose rate. The typical range is 15-35 mg/kg per dose. Use 22 mg/kg to convert a 10 mg/lb prescription.
mg/kg
Cephalexin is most commonly prescribed every 12 hours for skin and soft-tissue infections and every 8 hours for urinary tract or bone infections.
Select the form and strength dispensed by your vet or pharmacy. The calculator converts the dose into the right volume or fraction of a tablet.
Typical courses are 7-14 days for skin and soft-tissue infections, or 4-6 weeks for deep or bone infections. Enter the number of days your vet prescribed.
days
Dose per administrationWithin recommended range
80mg

Milligrams of cephalexin to give each time

Total daily dose160mg
Amount per dose0.32 tablets
Amount per day0.64 tablets
Total course (mg)1,600mg
Total course (formulation)6.4 tablets
Confirmed dose rate20mg/kg
20 mg/kg
Below range<15Recommended15-35Above range35+

80.0 mg per dose - 0.32 tablets of the selected formulation.

  • At 20 mg/kg, a cat weighing 4.00 kg needs 80.0 mg of cephalexin per dose, given every 12 hours (twice daily).
  • The dose rate falls within the standard 15-35 mg/kg range cited in veterinary references.
  • This dose does not land on a whole, half, or quarter tablet. Ask your vet for the oral liquid or a smaller tablet strength instead of estimating a tablet fraction.
  • Over 10 days the total course is 1600 mg.
  • Always complete the full antibiotic course even if your cat seems better early, to avoid recurrence or resistance.

Next stepCephalexin can be given with or without food. If your cat vomits after a dose, try giving it with a small meal. Contact your vet if you notice unusual lethargy, facial swelling, or diarrhea, which may indicate a reaction.

 = Powered by OnlyCalculators