Cephalexin For Cats Dosage
Calculate the right cephalexin antibiotic dose for your cat by weight. Free veterinary dosage calculator with tablet and liquid measurements, safety warnings, and charts.
About This Calculator
The Cephalexin For Cats Dosage Calculator helps pet owners and veterinarians determine the appropriate antibiotic dose for feline patients. Cephalexin is a first-generation cephalosporin antibiotic commonly prescribed to treat bacterial infections in cats, including skin infections, soft tissue infections, bone infections, and urinary tract infections.
The standard dosage range for cephalexin in cats is 15-35 mg per kilogram of body weight, administered every 8 to 12 hours. The calculator uses the formula: Single Dose = Cat Weight (kg) × Dosage Base (mg/kg). The daily dosage is calculated by multiplying the single dose by 2 (for twice-daily administration, the most common regimen).
For liquid formulations (125 mg/5 mL or 250 mg/5 mL), the calculator also determines the precise volume to administer in milliliters. The tool includes a safety warning indicator that highlights when the dose falls outside the standard 15-35 mg/kg range recommended by the MSD Veterinary Manual.
Cephalexin belongs to the beta-lactam class of antibiotics, similar to penicillin, and works by interfering with bacterial cell wall formation. It is classified as category C by the Antimicrobial Advice Ad Hoc Expert Group (AMEG), meaning it should only be used when no safer alternative is available.
Important: Always consult your veterinarian before administering any medication to your cat. This calculator is a reference tool and should not replace professional veterinary advice. The dosage may need adjustment based on your cat's specific condition, kidney function, and overall health status.
Frequently Asked Questions
How much cephalexin can I give my cat?
The typical cephalexin dosage for cats is 15-35 mg per kilogram of body weight, given every 8-12 hours. The exact dose depends on your cat's weight, the condition being treated, and your veterinarian's prescription. Always consult your vet before administering any medication.
How do I calculate the correct cephalexin dose for my cat?
Multiply your cat's weight in kilograms by the prescribed dosage base (usually 15 mg/kg). For example, a 4 kg cat at 15 mg/kg needs 60 mg per dose. Since cephalexin is typically given twice daily, the total daily dosage would be 120 mg. Use this calculator to get precise amounts for tablets or liquid formulations.
Can I give my cat human cephalexin?
Yes, human cephalexin is safe for cats when dosed correctly. However, veterinary-specific formulations are preferred for precise dosing. Never give your cat a full 250 mg or 500 mg human capsule without calculating the correct dose for your cat's weight.
What are the side effects of cephalexin in cats?
Common side effects include vomiting, diarrhea, decreased appetite, and drooling. More serious side effects include allergic reactions (rash, facial swelling, difficulty breathing), neurotoxicity, and blood disorders with prolonged high-dose use. Contact your vet if your cat shows signs of an allergic reaction.
How often should I give cephalexin to my cat?
Cephalexin is typically administered every 8 to 12 hours (2 to 3 times daily) for cats. The exact frequency depends on the condition being treated and your veterinarian's prescription. Complete the full course of antibiotics even if your cat seems better.
Can cats overdose on cephalexin?
Yes, cephalexin overdose in cats can occur if too high a dose is administered. Symptoms may include vomiting, diarrhea, tremors, and seizures. The recommended safe range is 15-35 mg/kg per dose. Always calculate the correct dose based on your cat's weight and never exceed the prescribed amount.
What is cephalexin used for in cats?
Cephalexin is a first-generation cephalosporin antibiotic used to treat bacterial infections in cats, including skin infections, soft tissue infections, bone infections, and urinary tract infections. It is effective against many gram-positive and some gram-negative bacteria but not against Pseudomonas, MRSA, or E. coli.