Convenia is a veterinarian-prescribed antibiotic medication indicated to treat certain types of bacterial infections in cats and dogs. It is administered as one subcutaneous injection beneath the surface of the skin, and is effective for up to 14 days, according to Pfizer Animal Health, the pharmaceutical distributor of this medication. Cats and dogs must be at least 4 months old before receiving Convenia.

Nausea or Vomiting

After receiving Convenia, cats and dogs may develop upset stomach side effects, including nausea or vomiting. During clinical trials for this medication, vomiting was observed in approximately 5 percent of dogs and 8 percent of cats, reports Upset stomach side effects may also contribute to a temporary decrease in appetite. Pet owners may notice that their pet is uninterested in eating at mealtime or won’t eat favorite treats. These side effects typically subside within a few days of treatment.