Convenia vs. Traditional Oral Antibiotics for Pets

Filed under Dr. Dym's Vet Blog
Unlike traditional oral antibiotics, Convenia is injectable and lasts up to 2-3 weeks

In recent years, many veterinarians are now reaching for the injectable antibiotic Convenia for many common infections presented to the veterinary clinic, including those of the skin, urinary tract and respiratory tract. Convenia is given typically as a single injection, which can last up to 2-3 weeks in pets. This convenient injection is a welcome relief to many animal guardians who don’t have to struggle and fight with their pets once to three times daily, which is the typical frequency that other oral antibiotics are given.

Many times, veterinarians will recheck the pet in 2 weeks for a second injection if needed, which often will resolve many common infectious diseases. There are very few negatives when using Convenia, except if the pet is allergic to the injected medication.  Allergic reactions that may be seen are most commonly digestive upset, especially diarrhea and/or vomiting. While this reaction is not common, if it does occur, it may last up to a few weeks, necessitating the need for medical management of these symptoms during this time. The only other negative reaction would be if the infection being treated is resistant to the antibiotic, in which case alternative antibiotic therapies will be needed in the following weeks.

Read Related Posts on PetMeds® Blog:

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  4. PetMeds® Addressing the Overuse of Antibiotic Pet Meds
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  1. Barbara
    Posted March 11, 2013 at 4:17 pm | Permalink

    My 14 year old cat had an upper respiratory and sinus infection. Without doing a culture, the local vet insisted the infection was caused by the Herpes virus and gave Buster 6 injections of Convenia in a 2 month timeframe. Instead of getting better, Buster became progressively worse. I took Buster to another clinic where Buster was given blood tests and a culture. The test results showed that Buster never had Herpes, but now he was dying of kidney failure. The tests further indicated that the infection was resilient to Convenia. Buster stayed in the clinic for 3 days where he was subjected to daily massive subcutaneous fluids. Despite these efforts, Buster’s kidney functions never improved, and he died a week later.

    Regardless of the claims Pfizer makes regarding Convenia, I now know that massive amounts of any antibiotic that remains in the system damages internal organs. And in the hands of incompetent and ignorant professionals, it becomes a lethal weapon.


    Dr. Michael Dym, VMD veterinarian Reply:

    Hi Barbara….Sorry to hear about your cat and unfortunate experience using convenia like that. if herpes was the cause, then no antibiotic should have been given so frequently as antibiotics dont cure viral infections anyway. At some point blood work should have been done in a cat this age before all of the injections.


    Barbara Reply:

    Hi Dr. Dym,
    Thank you for your update. At every visit, I did ask the vet why he gave Buster antibiotic injections if he suspected Herpes caused his respiratory problems. The vet said it was to prevent secondary infections. I also asked him to do a culture to ensure Buster really had Herpes, but he said there was no need for a culture because he saw the same symptoms hundreds of times, and it was always Herpes. Later, I was told by one of his assistants that a culture was never done because the vet did not know how to do a culture.
    I feel terrible guilt over what happened to Buster. Granted he was not a young cat, but he was strong, vital, and active, and he loved life. I made the mistake of trusting a so-called professional whose only interest was money instead of ethically treating my beloved pet.


    Dr. Michael Dym, VMD veterinarian Reply:

    Hi Barbara…..You clearly loved your feline companion very well. Sounds like your vet was just following typical standard of practice in traditional vet practice. Unfortunately not much traditional veterinary practice helps with feline herpes anyway, which is why vets reach for antibiotics. I have found long term holistic and/or homeopathic medicine much more effective.

  2. Posted May 1, 2013 at 10:42 am | Permalink

    My rat terrier, Dixie has some form of antibotic given since 12-01-12, for her lung infection. The infection has never cleared up, so yesterday April 30, 2013 my Vet. gave her Convenia, her breathing seems worse! She has had acid reflux from 12-01-12 and I have gave her Pepto Bismol for that . My question is can I give this to her will it react with the Convenia?


    Dr. Michael Dym, VMD veterinarian Reply:

    I would not give peptobismol for acid reflux. Famotidine or pepcid AC may be a better choice at dose of one half mg per pound once to twice daily. If signs persist, see vet for recheck and possibly chest x rays to make sure no other disease processes going on.


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