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Convenia (cefovecin sodium) is a prescription, long-acting cephalosporin injection that a veterinarian may use for a cat’s skin wound or abscess when susceptible Pasteurella multocida is suspected or confirmed. The U.S. feline label specifies one subcutaneous dose of 8 mg/kg (3.6 mg/lb). Therapeutic concentrations for that labeled organism are maintained for approximately seven days, while drug residues can remain in the body for up to 65 days. Those are different concepts: 65 days is not 65 days of antibiotic treatment. Whether Convenia is appropriate depends on the infection, culture results when available, allergy history, age, reproductive status, and other medicines.
What is Convenia for in cats?
Convenia is the brand name for cefovecin sodium, a third-generation cephalosporin antibiotic. In the United States, its feline indication is narrow: skin infections involving wounds and abscesses caused by susceptible strains of Pasteurella multocida. The U.S. prescribing information does not say that every cat wound, abscess, or skin infection will respond, nor that the injection covers every bacterium.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallP. multocida is commonly associated with bite wounds, but a cat’s lesion can contain mixed bacteria, resistant organisms, foreign material, or a non-bacterial problem. A veterinarian decides whether the clinical picture fits the label and whether culture and susceptibility testing would improve antibiotic selection. Drainage, flushing, removal of dead tissue, pain control, and other treatment may be just as important as the antibiotic.
How is Convenia given to a cat?
A veterinarian gives Convenia as a single subcutaneous injection. The labeled feline dose is 8 mg/kg (3.6 mg/lb), administered once; owners should not calculate, draw up, repeat, or inject it at home. It is a prescription veterinary medicine, and the clinic must select and prepare the dose for the individual cat.
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| Label detail | What it means |
|---|---|
| Route | Subcutaneous injection by a veterinarian |
| Feline dose | 8 mg/kg (3.6 mg/lb), one time |
| Named feline infection | Skin wounds and abscesses caused by susceptible P. multocida |
| Labeled therapeutic period | Approximately seven days for that susceptible organism |
The “one shot” format can help when a cat is difficult to medicate orally or when a caregiver cannot reliably give several days of tablets or liquid. It also removes the possibility of missed doses. The trade-off is that once injected, the medicine cannot simply be taken back if the diagnosis is wrong or an adverse reaction occurs, so the veterinarian needs a complete history before treatment.
How long does a Convenia shot last in cats?
For the labeled feline P. multocida infection, the prescribing information says therapeutic concentrations are maintained for approximately seven days. This is the clinically relevant duration stated for the approved feline use, not a guarantee that every infection will be cured in one week.
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The label’s population pharmacokinetic model predicted active free-drug concentrations above the cited P. multocida MIC90 for about seven days in 95% of cats studied. That is a model-based estimate across a population; an individual cat’s infection, immune status, tissue penetration, organism, and kidney or liver function can change the response. If the wound is not clearly improving, the answer is not to assume the injection needs to be repeated.
A pharmacokinetic publication also reported free cefovecin in tissue-chamber fluid above the cited MIC90 for at least 14 days. That tissue-fluid observation is different from the U.S. label’s approximately seven-day therapeutic-duration statement and should not be turned into a promise of 14 days of treatment for every cat.
How long does Convenia stay in a cat’s system?
Cefovecin leaves the body much more slowly than its labeled treatment period. The label says it may persist for up to 65 days; the FDA’s original approval summary estimates that approximately 65 days are needed to eliminate 97% of an administered dose. This does not mean the cat has 65 days of effective antibiotic coverage.
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After an 8 mg/kg dose, the label reports a mean feline plasma elimination half-life of 166 ± 18 hours (about seven days). “Half-life” describes how quickly the drug level declines, whereas “therapeutic duration” depends on whether the concentration remains high enough for a particular organism at the infected site. Residual drug can therefore remain measurable after concentrations have fallen below what is needed to treat the infection.
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What are the possible side effects of Convenia in cats?
In the feline field safety study cited in the label (147 cats given Convenia and 144 given an active control), reported events in the Convenia group included:
| Reported event | Convenia-group cats |
|---|---|
| Vomiting | 10 of 147 |
| Diarrhea | 7 of 147 |
| Decreased appetite | 6 of 147 |
| Lethargy | 6 of 147 |
These are counts from the cited study, not a prediction of an individual cat’s risk and not proof that Convenia caused every event. One separately reported treated cat had diarrhea that lasted 42 days before resolving. Voluntary reports from outside the United States include serious reactions such as anaphylaxis and injection-site reactions; because voluntary reporting does not establish how often events occur, those reports should be treated as safety warnings rather than incidence rates.
Seek urgent veterinary care for facial swelling, hives, trouble breathing, collapse, repeated vomiting, or sudden profound weakness—signs that can indicate a severe allergic reaction or another emergency. For milder vomiting, diarrhea, poor appetite, or lethargy, contact the prescribing clinic promptly for advice, particularly if the cat is young, elderly, dehydrated, or has another illness.
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Who should not receive Convenia?
Convenia is contraindicated in a cat with a known allergy to cefovecin or other beta-lactam antibiotics, including penicillins and cephalosporins. Tell the veterinarian about any previous reaction to an antibiotic, even if the reaction was years ago or the exact product is unknown.
The label says safety has not been determined for cats younger than four months or for breeding or lactating animals. That is a reason for a careful risk-benefit discussion, not a license to extrapolate safety. Provide a full list of prescription drugs, over-the-counter products, supplements, and recent injections: highly protein-bound medicines can compete for binding, and the veterinarian may choose another approach.
What should happen if the wound is not improving?
If improvement is absent or not acceptable within three to four days, the label calls for re-evaluating the diagnosis and considering appropriate alternative therapy. Contact the clinic rather than waiting for the injection’s residual drug to disappear.
- Call the prescribing veterinarian. Report swelling, drainage, odor, pain, appetite, activity, fever if measured, and whether the lesion is getting larger.
- Ask whether the wound needs examination or drainage. An abscess may require opening, flushing, or removal of a foreign body; antibiotics alone cannot correct a sealed pocket of pus.
- Discuss culture and susceptibility testing. Testing can identify the organism and help select an antibiotic when the response is poor, the infection is recurrent, or resistance is a concern.
- Do not add, repeat, or switch antibiotics yourself. Long persistence makes unsupervised “stacking” especially risky and can complicate later treatment decisions.
- Follow wound-care instructions exactly. Prevent licking or trauma as directed, keep follow-up appointments, and give any additional prescribed medicine for the full instructed course.
Red flags such as rapidly spreading swelling, severe pain, tissue discoloration, continuous bleeding, breathing difficulty, collapse, or inability to eat or drink warrant urgent care rather than routine follow-up.
Is there a generic version of Convenia?
Yes. On June 24, 2025, the U.S. Food and Drug Administration announced approval of the first generic cefovecin sodium injection for treating skin infections in dogs and cats. The FDA says it contains the same active ingredient as Convenia and is available only by prescription from a licensed veterinarian; the sponsor named in the announcement is Qilu Animal Health Products Co., Ltd. Read the FDA announcement for the regulatory details.
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Whether a clinic stocks the generic, uses the branded product, or selects another antibiotic is a veterinary decision. Availability, formulation details, and cost can vary by practice and location, so ask the prescribing clinic rather than assuming an automatic substitution.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is the veterinarian deciding when choosing Convenia?
This is not primarily a consumer product comparison. The decision involves several clinical questions:
- Does the infection match the labeled use? The U.S. feline label names susceptible P. multocida in wounds and abscesses.
- Is there evidence of another organism or a mixed infection? Culture and susceptibility results may point to a different or additional medicine.
- Can the cat safely receive a beta-lactam? Prior allergy, age, pregnancy or lactation, and concurrent medicines matter.
- Can the infection be managed mechanically? Drainage, debridement, flushing, and pain control may be essential.
- Will follow-up be possible? A long-acting injection is not a substitute for reassessment when healing stalls.
The label itself cautions against antibacterial treatment without a proven or strongly suspected bacterial infection because it may provide no benefit and can increase the risk of resistant animal pathogens. Antibiotic stewardship protects the treated cat and helps preserve effective medicines for future infections.
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What should I ask before my cat receives the injection?
- What infection and organism are you treating, and does it fit the feline label?
- Would a culture and susceptibility test change the antibiotic choice?
- What wound care, drainage, pain relief, or recheck is needed?
- Which signs mean I should call today, and which require emergency care?
- Could any of my cat’s medicines or supplements interact with a highly protein-bound drug?
- When should I expect visible improvement, and what is the plan if there is none after three to four days?
These questions help separate the convenience of one injection from the broader treatment plan the infection may require.
Frequently Asked Questions
Can Convenia be used for a cat’s dental infection or urinary infection?
The U.S. feline label cited here specifically covers skin wounds and abscesses caused by susceptible Pasteurella multocida. A veterinarian may consider other treatments for dental, urinary, respiratory, or different skin infections, but that would require a separate clinical judgment and is not established by the labeled indication.
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Can my cat receive Convenia twice if the abscess comes back?
Do not arrange repeat injections yourself. Because cefovecin can persist for up to 65 days, the veterinarian should reassess the diagnosis, drainage, culture results, and prior exposure before deciding on any additional antibiotic.
Should I avoid all penicillin antibiotics after a Convenia reaction?
Tell the veterinarian about the reaction and the exact symptoms. Convenia is contraindicated in cats with known allergy to beta-lactams, including penicillins and cephalosporins, so the clinician must determine whether another beta-lactam is unsafe or whether the event had a different cause.
Can I give my cat probiotics or supplements after Convenia?
Ask the prescribing veterinarian before adding any supplement. The label warns that highly protein-bound medicines can compete for binding, and the clinic needs a complete list of everything the cat receives to judge compatibility.
How soon should a cat eat normally after a Convenia injection?
There is no single guaranteed timetable. Decreased appetite was reported in the feline field study; contact the clinic if appetite does not promptly return or if vomiting, diarrhea, lethargy, dehydration, or worsening wound signs occur.
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