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Product Info
How to Use
Customer Reviews
Product Info
What is Cephalexin?

Cephalexin is a broad-spectrum antibiotic available as capsules or suspension used to treat bacterial infections of the skin, urinary tract, respiratory tract, bones, and joints. Cephalexin requires a prescription from your veterinarian.


Cats and Dogs

  • Effectively treats bacterial skin infections
  • Also treats infections of the urinary tract, respiratory tract, bones, and joints
  • Can prevent secondary infections
  • Sold affordably by individual capsules
How it Works:

Cephalexin is a cephalosporin antibiotic. Cephalosporin antibiotics suppress the growth of micro-organisms such as bacteria, fungi, or protozoa.


In the event of an allergic reaction - such as shortness of breath, rash, hives, vomiting, diarrhea, mucous or blood in the stool, swelling of the lips, tongue, or face, and unusual bleeding or bruising - contact your veterinarian immediately.

Brand Name:

Keflex (Advancis)

Generic Name:


What is Cephalexin:

Cephalexin is an antibiotic belonging to a class of drugs called cephalosporins that fight bacteria in the body. Cephalexin can be used to treat infections such as bronchitis as well as ear, skin, and urinary tract infections. Cephalexin may also be used for purposes other than those listed.

What should I discuss with my veterinarian before giving Cephalexin to my pet:

Tell your veterinarian if your pet has ever had an allergic reaction to another penicillin or to a cephalosporin. Tell your veterinarian if your pet has kidney disease, or a stomach or intestinal disease. Tell your veterinarian if your pet is pregnant or lactating. Cephalexin liquid suspension contains sucrose which may affect the treatment of diabetic pets.

How should this medication be given:

Give this medication exactly as directed by your veterinarian. Cephalexin can be given with or without food. Give all of the cephalexin even if your pet appears to be better. Symptoms may improve before the infection is completely treated. Store capsules at room temperature away from moisture or heat. Store the liquid suspension in the refrigerator. Discard any unused liquid suspension after 14 days.

What happens if I miss giving a dose:

Give the missed dose as soon as you remember, then try to evenly space the rest of the doses for that day until you can return to a normal schedule. Do not give a double dose unless otherwise directed by your veterinarian.

What should I avoid while giving Cephalexin to my pet:

There are no restrictions on food or activity during treatment with cephalexin unless otherwise directed by your veterinarian.

What are the possible side effects of Cephalexin:

Stop giving cephalexin and seek emergency veterinary medical care in the event of an allergic reaction (shortness of breath; hives; swelling of the lips, tongue, or face; rash; or fainting), severe nausea, vomiting or diarrhea, mucus or blood in the stool, or unusual bleeding or bruising. Other less serious side effects such as mild nausea, diarrhea, or yeast infection may be more likely to occur. Continue to give cephalexin and notify your veterinarian if these symptoms occur. Talk to your veterinarian about any side effect that seems unusual or bothersome to your pet.

What other drugs will affect Cephalexin:

Before giving cephalexin, tell your veterinarian if your pet is being given another antibiotic (for the same or a different infection), probenecid, or a loop diuretic such as furosemide or warfarin. You may not be able to give cephalexin or you may need to have the dosage adjusted. Drugs other than those listed here may also interact with cephalexin. Talk to your veterinarian or pharmacist before giving any prescription or over-the-counter medicines, including vitamins, minerals, and herbal products.

Where can I get more information:

Your pharmacist has additional information about cephalexin written for health professionals that you may read.

Call your veterinarian for medical advice about any side effects to your pet. You may report side effects to the FDA at 1-800-FDA-1088.

How to Use
  • Cephalexin is a broad spectrum prescription antibiotic used to treat bacterial infections of the respiratory tract (such as bronchitis), skin, urinary tract, bones and joints.
  • Cephalexin is not FDA approved for use in veterinary medicine; however, it is a commonly accepted practice for veterinarians to prescribe this medication for dogs and cats.
  • Cephalexin comes in either liquid or capsule form, and may be given on an empty stomach or with food to prevent stomach upset.
  • Give all of the Cephalexin that was prescribed for your pet. Symptoms may begin to improve before the infection is completely treated.
  • When mixed with 66 ml of water, each teaspoonful (5 ml) contains 250 mg of cephalexin. After mixing, store in the refrigerator and shake well before using. Discard any unused medication after 14 days.

Cephalexin Suspension contains sucrose which may affect the treatment of diabetic pets.

Dogs: Cats:
All Weights
Give 5-15mg per pound of pet's body weight every 8-12 hours
Do not use!

Store capsules at room temperature away from moisture or heat. Store the suspension (liquid) in the refrigerator.

Cephalexin Capsules 250 mg
Cephalexin Monohydrate 250 mg
Cephalexin Capsules 500 mg
Cephalexin Monohydrate 500 mg
Cephalexin Liquid
Cephalexin USP 250 mg/5 ml
Inactive ingredients: Colloidal silicon dioxide, FD&C Red No. 40, Sodium benzoate, Strawberry flavor, Sucrose, Xanthan Gum
Customer Reviews
Cephalexin is rated 3.473684210526316 out of 5 by 38.
Rated 4 out of 5 by from Works Fairley Well My 13 year old lab had a flaming infection on the side of her face. She wouldn't leave it alone so it bled and was a mess. I used this drug, Welfare Allergy pills (to stop the itching)and an Elizabethen collar. Wrapped in Kraft cheese and treated at 6am, 2 pm and 10pm. Within two weeks the collar was gone and she started to recover. She has been on these for 70 days and was on her way to recovery. After stopping the stink aand rot started to return. So even after 70 days treatment, this stuff didn't kill all the bad guys. Either she will be on this until her brain cancer gets her or we will try another method. But I would recommend these to fix smaller infections anytime.
Date published: 2016-03-03
Rated 5 out of 5 by from Cephalexin Eddy is a collie with a very long nose, he has a tendancy to get sinus infection for some reason, the only thing that helps him is Cephalexin. within a matter of hours he is breathing better and mucus is gone. The only bad part is once he is off for a couple months, he seems to come back to the infection. Not sure why...but this drug is a miracle for him. We Love Eddy and we Love Cephalexin.
Date published: 2015-12-18
Rated 5 out of 5 by from Works for UTI My German shepherd had a urinary infection. I put her on Cephalexin and she improved immediately. I missed a days dosing, my fault, and she relapsed. Now she is back on it, has no side effects at all and is doing well. I am now very careful to give it every 8 hours.
Date published: 2015-11-23
Rated 1 out of 5 by from Not a good antibiotic for my lab My 2 year old Lab was given this after her ACL surgery. After starting this antibiotic she wouldn't eat, was panting, drooling and lethargic. Not knowing it was the antibiotic we were worried that something had went wrong with the surgery. We took her back to the vet. They did blood work, which all came back good. The vet changed her antibiotic and she was back to normal.
Date published: 2015-05-31
Rated 4 out of 5 by from Cephalexin My pups is doing great. Her skin is healing slow but steady. No side effects from the medication.
Date published: 2015-03-22
Rated 5 out of 5 by from Works great for Buddy! Buddy takes this med for a skin condition. Works great. Must take for a full 7 days. No noticeable side effects observed.
Date published: 2015-01-17
Rated 1 out of 5 by from CONSTIPATION I'm hard pressed to find others who's dogs suffered constipation from this antibiotic like my Sheltie/Pom. Even though she naturally drinks a lot of water and I was supplementing with probiotics and pure pumpkin, she was backed up for two days. She was finally able to relieve herself fourteen hours after the last pill which I cut in half. She only had three and a half pills in total, I refuse to finish the bottle which was prescribed for a first-time flea allergy. I'm replacing it with colloidal silver which is what I use for myself. (Argyria is a big pharma hoax). I'd be interested to see who else has dealt with the constipation issue.
Date published: 2014-11-22
Rated 5 out of 5 by from Fixed my goldendoodle My soon to be 10 year old goldendoodle was put on this medication for her bursting lump cyst. She got really sick from. The stuff from the cyst leaked inside of her and she got really sick and painful joints. Im so happy this medication helped her alot. I see bad reviews about this medication. I guess alot of dogs have a different reacting from cephalexin. My dog has kidney issues and she does super on these. My dog has been on these twice before due to UTI and when she got a lump removed last year. So I knew she would be fine on these again.
Date published: 2014-08-11
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I have a 65 lb mix breed with reoccurring UTI, just got the 500mg and was wondering how many days should i give her twice a-day ( or even if i should do 3 times a day)

Asked by: Kevin
It can depend on the severity of the infection. Contact your veterinarian about the dosing they want your pet to have.
Answered by: paulpharmacistintern
Date published: 2016-08-04


how do you know if your dog takes 250mg or 500mg? i have a english bulldog with a ear infection
Asked by: Ann
10 mg per lbs 3 time per day for 10 days
Answered by: Mickey
Date published: 2015-11-24

I have 500 mg do i give my cat the whole pill once a day or twice a day

Asked by: Care
No kitty should get 10 mg per lb. if you have a 10 lb cat, that is 100 mg. Open the capsule, pour the powder on a solid surface. Divide it into 5 doses. Deliver 3 doses every 8 hours. Better yet get the right doses drug. You will harm your cat by giving it such a high dose
Answered by: Mickey
Date published: 2015-11-24

do you have a remedy for this

Ruby still under her belly and inside her legs stay reddish and does not dry up. Do you have a remedy for this.
Asked by: bob
Please consult your veterinarian for a diagnosis.
Answered by: Stephanie Duesler, Pharm. D, MBA
Date published: 2015-05-29

should i give my cat 50 mg keflex for UTI?

Asked by: Care
Your veterinarian will determine the appropriate dose to treat your pet's condition.
Answered by: Stephanie Duesler, Pharm. D, MBA
Date published: 2015-03-26

Cephalexin 500MG

My Pomeranian weighs about 11 pounds and the prescription I have is cephalexin 500 MG, this seems a little high for my dog should it be about about 150 MG for his size or is 500MG OK for my dog
Asked by: GDW
The dose is dependant on the condition being treated and could vary. Please speak to your veterinarian if you have any concerns.
Answered by: Stephanie Duesler, Pharm. D, MBA
Date published: 2015-03-26

Red tear stains

Red tear stained eyes for a puppy does this work
Asked by: Puppy
i have seen this anti biotic used for infections involving tear ducts. Did your vet mention this medication as a possibilty ? We also have a product called Angel Eyes. It doesnt have an antibiotic in it.....but once the infection is addressed, perhaps it could be a maintenance solution to clear tear stain. Ask your vet what they think Thank you and good luck !
Answered by: Linda M 1800petmeds pharmacist
Date published: 2014-09-24

human use for dental infection ?

Asked by: joycie
We do not dispense any medication for human use.
Answered by: Pharmacist
Date published: 2014-06-11
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