Side Effects of Convenia in Cats

Updated November 21, 2016

Convenia is a prescription antibiotic that treats wounds and abscesses in cats. The medicine is injected with a needle, and only veterinarians can administer it. A single dose of Convenia offers 14 doses of antibiotics, so wounds and infections heal quickly. Similar to many medications, Convenia can cause a number of adverse reactions in cats.


In some cases, a cat's body will react to the change that comes with antibiotics. The cat's system will try to expel the medication by vomiting. This is not something that should worry you unless the vomiting continues for more than a couple of days. Contact a veterinarian if the vomiting occurs for longer than a couple of days. Other reasons to contact a veterinarian is if there is blood in the vomit or if it is accompanied by diarrhoea.


Diarrhoea is another reaction that sometimes results from antibiotics. If diarrhoea occurs right after the cat has been given Convenia, don't worry. You should contact a vet, however, if there is blood in the diarrhoea or if the cat is also vomiting. When vomiting and diarrhoea happen at the same time, there is a risk of dehydration in the cat.

Change in Appetite

You may witness a change in appetite in your cat after it receives Convenia. The change is usually a decreased appetite or no eating at all. This is a normal reaction to antibiotics, but it's important that cats continue to drink water.

Strange Behavior

Some cats experience a sudden change in behaviour after being treated with Convenia. For some cats, the antibiotic makes them extremely sluggish and lethargic. Other cats get a jolt of energy from the medicine and become extremely hyper.

Inappropriate Urination

Convenia may cause inappropriate urination in some cats. This means that the medicine may have caused an increase in the production of urine. Since the antibiotic has an effect on a cat's behaviour, the urination may take place outside of the box due to confusion. If the cat cries out during the inappropriate urination or looks like it is in pain, contact a veterinarian.

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About the Author

Megan Richardson began her career as a freelance writer and editor in 2009. She has experience in public relations and event planning, and she worked as a writer's assistant to a published author for more than a year. Her work has also appeared in "The Daily Sentinel." Richardson holds a Bachelor of Arts in communication and journalism from Stephen F. Austin State University