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Cephalexin for Cats

Cephalexin (Keflex) is a first-generation cephalosporin antibiotic used in cats for skin, UTI, respiratory, and other bacterial infections. Standard dosing is 10–15 mg/kg (or 22–33 mg/lb) every 8–12 hours. Always follow your veterinarian's prescription.

Concept Fundamentals
10–15 mg/kg
Dose Range
q8–12h
Frequency
7–14 days
Duration
Capsules, liquid
Forms
Calculate Cephalexin DoseEnter cat weight, infection type, and treatment duration

Why This Biology Metric Matters

Why: Proper antibiotic dosing ensures effective treatment and reduces resistance risk. Underdosing can fail; overdosing increases side effects.

How: Dose = weight (kg) × 10–15 mg/kg per dose. Multiply by frequency and duration for total medication needed.

  • ●Skin and UTI infections typically need 7–14 days; respiratory may need longer.
  • ●Liquid suspension is easier for cats; capsules can be hidden in treats.
  • ●Complete the full course even if the cat improves—stopping early promotes resistance.
Sources:Merck Veterinary ManualASPCA Animal Poison Control

Calculate Cephalexin dosage for cats. Weight-based dosing for skin, UTI, respiratory, and other bacterial infections.

Compact Examples

Small Cat - Skin Infection

8 lb domestic shorthair with skin infection

Medium Cat - UTI

12 lb Maine Coon with urinary tract infection

Large Cat - Abscess

15 lb Ragdoll with abscess from fight wound

Kitten - Respiratory Infection

4 lb kitten with upper respiratory infection

Enter Cat Information

🐱 Cat Weight

Enter your cat's weight

💊 Medication Form

🏥 Treatment Details

For educational use only. Always confirm dosages and care with a licensed veterinarian.

🧬 Biology Facts

💊

Cephalexin is bactericidal; it kills bacteria by disrupting cell wall synthesis.

🐱

Cats tolerate cephalexin well; GI upset is the most common side effect.

⏱️

Give with food to reduce stomach upset. Administer at consistent intervals.

🩺

Veterinary prescription required. Never use human antibiotics without vet guidance.

📋 Key Takeaways

  • • 10–15 mg per pound (22–33 mg/kg) per dose. Twice daily typical.
  • • Cats metabolize differently than dogs — always use cat-specific dosing.
  • • Requires veterinary prescription. Complete full course even if symptoms improve.
  • • Give with food. Kidney disease may require dose adjustment.

💡 Did You Know?

💊Cephalexin (Keflex) is a first-generation cephalosporin. Effective against skin, UTI, respiratory infections.Source: Vet med
🐱Never use dog medications for cats. Different metabolism and possible toxic ingredients.Source: Feline pharmacology
🔬Works by disrupting bacterial cell wall synthesis. Bactericidal—kills bacteria.Source: Antibiotic mechanism
⏱️Most cats improve within 24–48 hours. Still complete full 7–14 day course.Source: Treatment timeline
🩺Kidney disease common in cats. Cephalexin cleared by kidneys—dose may need adjustment.Source: Renal clearance
🍽️Give with food to reduce stomach upset and improve absorption.Source: Administration

📖 How Cephalexin Dosing Works

Dose is based on cat weight. Standard range: 10–15 mg per pound per administration, typically every 8–12 hours.

Formula

Dose (mg) = Weight (lbs) × 10–15 mg/lb

Example: 10 lb cat → 100–150 mg per dose. Use 250 mg capsule (≈ half) or liquid.

🎯 Expert Tips

💡 Complete Full Course

Never stop early. Stopping can cause resistance and recurrence.

💡 Give with Food

Reduces stomach upset. Mix powder in wet food if needed.

💡 Kidney Function

Inform vet about kidney disease. Dose may need adjustment.

💡 Vet Prescription Only

Never use human meds or adjust dose without vet guidance.

⚖️ Dosage by Weight

WeightDose/AdminFrequency
2–5 lbs20–75 mgq8–12h
6–10 lbs60–150 mgq8–12h
11–15 lbs110–225 mgq8–12h
16–20 lbs160–300 mgq8–12h

❓ Frequently Asked Questions

How long until Cephalexin works?

Most cats improve in 24–48 hours. Complete full course (7–14 days) even if better.

Can I give human Cephalexin to my cat?

No. Never without vet guidance. Dosages differ; vet must determine treatment.

What if I miss a dose?

Give when remembered. If near next dose, skip missed. Never double dose.

Can kittens take Cephalexin?

Yes, with vet-calculated dose based on weight and age.

Cat vomited after dose?

If within 30 min, may re-administer. If persistent, contact vet.

How to store?

Capsules: room temp. Liquid: refrigerate. Discard after expiration.

Cat has kidney disease?

May still use Cephalexin; dose may need adjustment. Inform vet.

📊 Cephalexin by the Numbers

10–15
mg/lb per dose
q8–12h
Typical frequency
7–14
Days typical course
24–48h
Improvement often seen

⚠️ Disclaimer: Educational only. Cephalexin requires a veterinary prescription. Always consult your vet. Never use human meds or adjust doses without vet guidance. Cats metabolize differently than dogs—use cat-specific dosing.

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