My Dog is Lethargic After Taking Cephalexin

Cephalexin (brand name Keflex) is an antibiotic prescribed to treat bacterial infections in both dogs and cats. Though it is generally a very safe drug for both species, some pet owners report their dog or cat becoming lethargic after taking cephalexin. There are a few things you should know about this medication and how it affects dogs.

Cephalexin dog lethargic

Can cephalexin make a dog lethargic?

Generally, it’s very effective, but like all antibiotics, it can have side effects. The drug may cause several side effects in your dog such as diarrhea, lethargy, vomiting, loss of appetite, and so on. If your pet shows any of these symptoms get in touch with your vet immediately.

When should I take my dog to the vet for lethargy?

Dogs will show signs of lethargy if they are not feeling well because they are not eating or drinking as much as usual. Dogs with serious conditions will also not want to interact with their owners or other dogs, which could be an indication that something is wrong with them but usually isn’t dangerous unless it persists for longer than two days.

What can I do if my dog is lethargic and not eating?

One of the most crucial things you can do for your lethargic pet is to make sure he continues to eat and drink. Their body needs the energy to fight infection and repair damaged cells. They won’t be able to fend for themselves if they don’t receive the nutrients they need from food.

You can’t give a sick dog his usual dry food and expect him to get better. He needs something soft, digestible, and bland. Boiled chicken, white rice, and bone broth are ideal for this condition.

The best diet for a sick dog is one that will produce the least disturbance in the digestive organs. Hence highly seasoned and strongly-flavored foods are to be avoided.

Offering your dog wet food when they’re not eating much will help to give them some extra moisture in their diet. This can help prevent dehydration, which is a common side effect of dogs who are off their food. Dogs who are dehydrated may also have a more difficult time fighting off illnesses and diseases, so it’s important to keep an eye on your dog’s fluid intake.

If your dog refuses food, force-feed her with a syringe. If she still won’t eat after this, take her to the veterinarian immediately.

What are the side effects of cephalexin in dogs?

Cephalexin side effects include mild gastrointestinal upset, loss of appetite, vomiting, and diarrhea. Serious side effects include allergic reactions and seizures. If you notice any unusual side effects contact your veterinarian immediately.

How many days should a dog take cephalexin?

The dose and length of treatment depends on the seriousness of the infection, but a typical dosage is 22 mg/kg (10 mg/lb) of body weight twice daily for 28 days.

A dog should not be given cephalexin if he has a history of allergic reactions to any antibiotics in the cephalosporin family.


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Hannah Elizabeth is an English animal behavior author, having written for several online publications. With a degree in Animal Behaviour and over a decade of practical animal husbandry experience, Hannah's articles cover everything from pet care to wildlife conservation. When she isn't creating content for blog posts, Hannah enjoys long walks with her Rottweiler cross Senna, reading fantasy novels and breeding aquarium shrimp.

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