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The Side Effects of Clavamox for Cats

By Jane Meggitt | Updated September 26, 2017

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If your cat is diagnosed with a bacterial infection, there's a good chance your vet will prescribe Clavamox for treatment. Clavamox, a combination of amoxicillin trihydrate and clavulanate potassium, is used to treat various infections, including those of the skin, bone, bladder, mouth and many wounds. While most cats tolerate Clavamox quite well, some will develop side effects from the drug. Report any side effects to your veterinarian immediately.

Clavamox Side Effects

Clavamox's primary side effects involve the gastrointestinal tract. Some cats might experience vomiting, diarrhea or appetite loss. Even if the cat doesn't develop true diarrhea, you might notice that his stools are looser than normal. Your vet might advise you to feed Clavamox with food to minimize stomach problems.

Allergic Reactions

Some cats are allergic to penicillin, and will react to the amoxicillin in Clavamox. Allergic reactions include itching, facial swelling and breathing difficulties. Cats known to have a penicillin allergy should never receive Clavamox.

Photo Credits

  • Wavebreakmedia Ltd/Wavebreak Media/Getty Images


Jane Meggitt has been a writer for more than 20 years. In addition to reporting for a major newspaper chain, she has been published in "Horse News," "Suburban Classic," "Hoof Beats," "Equine Journal" and other publications. She has a Bachelor of Arts in English from New York University and an Associate of Arts from the American Academy of Dramatics Arts, New York City.