Convenia is used to treat infections caused by certain specific bacteria (see the SPC for further details). It is generally given as a single injection, and the effect of the injection lasts for up to 14 days. It is also used in dogs to treat urinary tract infections caused by certain specific bacteria.Click to see full answer. Also question is, what bacteria does convenia treat?CONVENIA is indicated for the treatment of skin infections (secondary superficial pyoderma, abscesses, and wounds) in dogs caused by susceptible strains of Staphylococcus intermedius and Streptococcus canis (Group G). how quickly does Convenia work? An injection of CONVENIA, delivered by your veterinarian, provides your pet with: Fast treatment: Reaches peak antibiotic blood levels within 6.2 hours and works around the clock for up to 14 days to eliminate common bacterial skin infections and their signs. Simply so, what is Convenia injection for dogs? Convenia (manufactured by Zoetis) is an injectable long-acting antibiotic that is labeled for the treatment of skin infections in cats and dogs. It exerts its antibacterial effects for approximately 1-2 weeks but stays in the body for over 2 months.How much does a Convenia injection cost?While the cost of a two week supply of an oral cephalosporin and a single injection of Convenia is similar for cats and small dogs, a Convenia injection for a big dog can easily run over $100 dollars.