Cats » is my cat having an allergic reaction to antibiotic


This question is related to: timmy the cat

Age:16 years 6months
Fed On:james well beloved,whiskas,felix whatever he will eat
Kept:indoors now

is my cat having an allergic reaction to antibiotic

on 14 november I took my cat to my vet who diagnosed an upper respiratory infection. He gave him 0.34 Convenia injection.80mg/ml inj 4ml. When we returned from the vet he was walking normally. Later that evening he appeared very weak and unable to stand. he kept falling over and has had problems with his balance ever since.He is very subdued though now eating some Whiskas soup.I took him to a different vet yesterday who said he may have a brain tumour as the symptons of loss of balance indicate. He was perfectly ok before the injection.Is it possible that this long lasting antibiotic has caused the dizziness and lethargy


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Martina Stuart

very very occasionally yes.
Adverse reactions to Convenia are very rare in cats. ( reportedly no more common that to any other antibiotic. They may include vomiting, diarrhea, decreased appetite, lethargy, odd hyperactive behavior, and inappropriate urination. Mildly increased serum alanine transaminase (ALT) and gamma-glutamyltransferase (GGT)may also occur.[1] . These can be assayed on blood tests.

Other reported events in dogs and cats include death, tremors/ataxia, seizures, anaphylaxis, acute pulmonary edema, facial edema, injection site reactions (alopecia, scabs, necrosis, and erythema), hemolytic anemia, salivation, pruritus, lethargy, vomiting, diarrhea, and inappetence.[4]

The mean elimination half-life was found to be 6 to 7 days in the cat which accounts for its extremely long therapeutic effect.

Please do report this incident to your vet and keep us informed of the progress.



Update on Timmy. I think it must have been an adverse reaction to the antibiotic. He is now eating normally and has got his balance back . He does hold his head slightly to one side but thats the only thing that seems wrong. He sleeps a lot but thats his age. Thanks for your answer. He hasnt had any seizures as one of the vets suggested he might so I am thankful for that


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