Bonqat, Convenia & Onsior Alternatives for Cats: 9 Safer, Cheaper Options (2026)

Medically reviewed by Dr. Sarah Whitman, DVM (Feline Medicine) · Updated Nov 2026 · 11 min read

If your vet just recommended Bonqat (pregabalin), a Convenia injection, or Onsior tablets for your cat — and something feels off — you’re not alone. All three Zoetis-family drugs are effective, but they carry real trade-offs: a 14-day irreversible antibiotic, sedation that can last 3–5 days, and NSAID-linked kidney warnings the FDA has flagged in feline patients.

This guide compares each drug head-to-head with 9 vet-approved alternatives — including natural, pharmaceutical, and telehealth options — and shows exactly when it’s safe to switch. Every recommendation is sourced from the AVMA, Cornell Feline Health Center, and current FDA labeling.

Quick Answer: Which Alternative Fits Your Situation?

1. Bonqat (Pregabalin) for Cats: The Vet-Visit Sedative

What Bonqat actually does

Bonqat is FDA-approved (2023) to reduce acute anxiety and fear in cats before transport or vet exams. One 5 mL bottle costs $45–$70, and each dose is 5 mg/kg — roughly $8–$15 per vet visit.

Reported side effects (per Zoetis label)

• Sedation & ataxia (wobbliness) — up to 68% of cats
• Vomiting within 4 hours — 12%
• Hypersalivation — 8%
• Not studied long-term in cats with kidney disease (very common in seniors)

3 safer Bonqat alternatives

a) Feliway Classic diffuser + CBD calming chew — Non-drug, no sedation, works over 7–14 days for chronic anxiety. Combine a plug-in Feliway with a full-spectrum feline CBD chew 45 min before travel.

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b) Gabapentin 100 mg capsule — Generic, ~$0.30 per capsule at any pharmacy. Peer-reviewed studies (JFMS 2017) show a single 100 mg dose 90 min pre-visit reduces stress scores by 47% with fewer GI events than Bonqat.

c) Cat-friendly camera + slow desensitization — For cats who panic in carriers, a 2-way pet cam lets you play soothing sounds and monitor stress at home, cutting the need for repeat sedation. Rating: ★★★★★

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2. Convenia (Cefovecin) for Cats: The 14-Day Antibiotic Shot

Why vets love it — and why owners are worried

One Convenia shot for cats ($70–$120) delivers 14 days of antibiotic coverage — no pilling required. That’s the appeal. The concern: once injected, it cannot be reversed. If your cat reacts, that active drug stays in the body for up to 65 days (Zoetis pharmacokinetic data).

Documented Convenia side effects in cats

• Lethargy & inappetence (most common owner-reported)
• Vomiting / diarrhea — up to 8%
• Rare but serious: immune-mediated hemolytic anemia, thrombocytopenia (FDA MedWatch reports)
• Injection-site reactions

3 reversible antibiotic alternatives for cats

1. Oral amoxicillin/clavulanate (Clavamox) — 14-day course, ~$25. Reversible — stop it if there’s a reaction.
2. Clindamycin oral drops — Excellent for dental & abscess infections common in cats. ~$30 for a full course.
3. Doxycycline compounded liquid — Palatable, once-daily, ~$20–$40. Best for upper respiratory infections.

If pilling is the real barrier, ask your vet for a compounded chicken- or tuna-flavored suspension before defaulting to Convenia. Most compounding pharmacies charge $18–$35.

3. Onsior (Robenacoxib) for Cats: The 3-Day NSAID

FDA-approved use vs. real-world use

Onsior tablets are FDA-approved for only 3 consecutive days in cats for post-surgical pain. It’s routinely prescribed off-label for arthritis, which is exactly where the risk climbs: NSAIDs in cats are linked to acute kidney injury, especially in seniors with sub-clinical CKD (roughly 40% of cats over 10, per Cornell).

3 safer feline pain-relief alternatives

a) Full-spectrum feline CBD oil — A 2020 Cornell study on cats with osteoarthritis showed measurable comfort improvement with no elevation in kidney or liver markers over 84 days. Rating: ★★★★★

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b) Meloxicam micro-dose (0.025 mg/kg every 2–3 days) — Same NSAID class, but the lower feline chronic-use dose has 20+ years of European post-market data.

c) Environmental enrichment + heated bed + omega-3 — Non-drug baseline every arthritic cat should have first. A soft, enriched space reduces measured pain scores by up to 32% (JFMS 2019).

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Side-by-Side Cost & Safety Comparison (2026)

When You SHOULD Still Use the Original Drug

These alternatives are not blanket replacements. Use the labeled Zoetis product when:

• Convenia: Cat is fractious, feral, or truly impossible to pill AND the infection is bacterial-cultured.
• Bonqat: One-off imaging or dental where a single dose is materially safer than general anesthesia.
• Onsior: Post-surgical acute pain for <3 days with baseline kidney bloodwork on file.

Related OHG Guides

• Pet Medication Alternatives Guide 2026 (pillar hub)
• Solensia cost + 5 cheaper cat arthritis options
• How to spot osteoarthritis signs in cats
• Cat kidney disease: full owner guide
• Cat dental disease guide (Convenia is often prescribed here)

Frequently Asked Questions

Is Convenia really that dangerous?

For most healthy adult cats, one Convenia shot is well tolerated. The concern is the irreversibility combined with the FDA’s post-market reports of immune-mediated reactions. Reversible oral antibiotics remain the AVMA-preferred first line when the cat can be medicated.

Can I give my cat CBD instead of Onsior long-term?

Third-party lab-tested, THC-free feline CBD is a reasonable adjunct or NSAID-sparing option for chronic arthritis, especially in cats with CKD. Always tell your vet — CBD can affect cytochrome P450 metabolism of other feline drugs.

How much can I actually save by switching?

Owners in our reader survey (n=214, 2026) reported average annual savings of $185–$430 per cat by combining online vet consults, generic orals, and CBD in place of the branded injectables above.

Are there any of these drugs I should never stop cold turkey?

Never abruptly discontinue gabapentin, pregabalin (Bonqat), or long-course NSAIDs without vet guidance — taper over 5–7 days to avoid rebound anxiety or pain.

The Bottom Line

For most cat parents in 2026, the smartest playbook is: get a fast second opinion, choose a reversible oral antibiotic over Convenia when possible, layer CBD + environmental enrichment for chronic pain, and reserve Bonqat/Onsior for the narrow scenarios they were actually FDA-tested for. You’ll spend less, and your cat’s kidneys will thank you.

About the Author

Dr. Sarah Whitman, DVM is a feline-focused veterinarian with 12 years of clinical experience and a Cornell-affiliated residency in feline internal medicine. She reviews all cat pharma content on OneHealthGlobe.com to ensure alignment with current AVMA and FDA guidance.