The Side Effects of Cephalexin for Dogs

Veterinarians prescribe cephalexin for dogs to treat bacterial infections. While the medication is approved for human use, the FDA has not issued the same approval for animals. Despite this, veterinarians still use Keflex or cephalexin because of its effectiveness treating infections of the skin layers, urinary system, bones and respiratory system.

Cephalexin for Dogs Works like Penicillin

While some dogs handle their cephalexin dosage without problem, other dogs are allergic to penicillin mold and medications that function in the same manner as penicillin. Symptoms of an allergic reaction to cephalexin include:

  • Hives
  • Rash
  • Shortness of breath
  • Swelling of the face and mouth

If your dog shows any of these symptoms after taking cephalexin, contact your veterinarian immediately.

Nausea and Vomiting with Cephalosporin Antibiotics for Dogs

The most common cephalexin side effects include nausea and vomiting. To prevent this, make sure your pet takes the cephalexin dosage after a meal and with plenty of fresh water.

Symptoms of Cephalexin Overdose

If you forget to give your pet a dose of cephalexin, do not double up the amount. This can cause overdose symptoms that include:

  • Abdominal pain
  • Diarrhea
  • Muscle spasms
  • Muscle weakness
  • Seizures
  • Vomiting

If your pet is showing these side effects of the medication and it's possible you might have given too much medication, contact your veterinarian.