The cephalexin for dogs dosage calculator will allow you to check whether the amount of antibiotic you give to your pet is similar to the recommended one. Our tool will let you know how much cephalexin for dogs you really need — it'll also show you how many tablets or how much liquid you'll need for daily therapy.

💊 Keep on reading — we'll talk about:

  • Different cephalexin side effects in dogs;
  • Explain Keflex dosage for dog and its possible applications; and
  • Discuss whether Lupin 500 for dogs is safe.

❗ We try to do our best when creating our calculators — however, you must remember that they cannot replace actual medical advice and cannot serve as a sole source of clinical decisions. Contact your vet in case of any doubt.

What is cephalexin for dogs?

Cephalexin is an antibiotic and a member of the beta-lactams group that works for the variety of different bacteria. Vet doctors use it to treat urinary tract and skin infections. 🦠

💡 Beta-lactams are probably the most popular type of antibiotics — everybody knows of the famous penicillin or amoxicillin used in most common bacterial infections in humans.

Pharmacies sell cephalexin under multiple different brand names, such as Keflex, Lupin, Rilexineonly the latter is registered for oral use in dogs, and only in chosen countries. It is available in the form of chewing tablets.

What about other medicines for dogs? Let's widen our horizons and calculate canine-friendly dosages for:

What is the cephalexin dosage for dogs with a UTI?

Dogs with a UTI should take cephalexin:

  • For 14 days;
  • Twice per day;
  • With a dosing of 15 mg for every kilogram of body weight (15 mg/kg) per single dose.

With two doses per day, your dog will consume a total of 30 mg/kg of cephalexin over 24 hours of treatment.

Considering the dosage above:

  • 500 mg of cephalexin will be correct for dogs of about 33 kg (73.5 lb).
  • 250 mg of cephalexin will be correct for pets that weigh around 16.7 kg (36 lb).

What are the side effects of cephalexin in dogs?

The possible sides effects of cephalexin include:

  • Allergic reactions, including skin rashes and problems with breathing;
  • Vomiting and diarrhea; and
  • Lethargy.

Additionally, some breeders report the occurrence of weakness and lameness (polyneuropathy) in certain pure breeds of dogs after administration of a human drug Keflex in an off-label (not registered) manner.

We shouldn't use cephalexin in animals:

  • Who have previously suffered from beta-lactams, penicillin or cephalosporin allergies;
  • In puppies smaller than 1 kg (2.2 lb); or
  • In dogs whose kidneys are damaged or impaired.

How to use the cephalexin for dogs dosage calculator?

It's easier than it should be! 🤓

  1. Enter your dog's weight in your preferred unit.
  2. Choose the drug type. You may choose from different strengths of:
    • Medication in a liquid form;
    • Regular tablets; or
    • Chewable tablets.
  3. Your results will be displayed immediately. 🎉 The calculator will show you the amount required for a single dose and the entire day of treatment.

PS. Remember that our calculators work both ways! You may easily check whether e.g., 500 mg of cephalexin is indeed a correct dose for your canine friend.

Happy with the cephalexin for dogs dosage calculator? Try our other pet tools!

Can I give my dog cephalexin?

The phrase "cephalexin killed my dog" is trending online. But is there anything we should be afraid of? 🤔

As with every medication, cephalexin has a few side effects that we should consider. The most important ones are rare allergies, which may lead to shock or even death. That's why you should never give cephalexin to a dog that has already had an allergic reaction to beta-lactams or penicillin.

❗ Remember — never give your pets any human medication without consulting your vet first.

Always monitor your dog closely after the first few doses — contact your vet in case of any doubt.

How do I calculate cephalexin dosage for dogs?

The calculations are extremely simple — follow the equation presented below.

Single dose = 15 mg × weight

Where:

  • Single dose is given in milligrams [mg].
  • weight is your dog's weight in kilograms [kg].

Cephalexin is given twice per day — each dose should be administered 12 hours apart. If you'd like to calculate the total daily dose, use the following formula:

Total daily dosage = Single dose × 2

How to read cephalexin dog dosage chart?

It's not difficult at all — find your dog's weight in the table and discover the corresponding dosage! Here's an easy-to-go cephalexin dosage chart for dogs you may use: 🐩

Weight (kg)

Weight (lb)

Single dose (mg)

1

2,2

15

2

4,4

30

3

6,6

45

4

8,8

60

5

11,0

75

6

13,2

90

7

15,4

105

8

17,6

120

9

19,8

135

10

22,0

150

11

24,3

165

12

26,5

180

13

28,7

195

14

30,9

210

15

33,1

225

16

35,3

240

17

37,5

255

18

39,7

270

19

41,9

285

20

44,1

300

21

46,3

315

22

48,5

330

23

50,7

345

24

52,9

360

25

55,1

375

26

57,3

390

27

59,5

405

28

61,7

420

29

63,9

435

30

66,1

450

If you want to have the dosage calculated for you, try our cephalexin for dogs dosage calculator on your left.

FAQ

Is cephalexin 500mg safe for dogs?

It's both a yes and no.

Cephalexin was proven as safe for dogs. However, you should always consider your dog's weight when dosing a medication — 500 mg is an appropriate dose for a 33 kg (73.5 lb) dog, it could be dangerous for a tiny pet that weights only 1 kg (2.2 lb).

Łucja Zaborowska, MD, PhD candidate
Your dog's weight
lb
Amount per dose
mg
Drug type
Chewable tablets (150 mg)
~Tablets per dose
#
Daily dosage
mg
~Tablets per day
#
📍 The calculated dosage is based on NOAH recommendations and is equal to 15 mg/kg per dose.
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