Simparica vs Bravecto (2026): Vet-Backed Comparison for Dogs & Cats — Which Flea & Tick Chew Wins?
If you’ve stood in the pet aisle staring at two orange boxes wondering whether Simparica or Bravecto is the right flea and tick chew for your pet — you’re not alone. Both are FDA-approved, vet-prescribed isoxazoline chewables from major pharma brands (Simparica by Zoetis, Bravecto by Merck). Both kill fleas and ticks. But they differ in how long each dose lasts, which parasites they cover, and how they’re dosed — and those differences decide which one actually fits your dog or cat.
This 2026 guide breaks down the real, vet-referenced differences so you can pick with confidence — and if you need a fast, legit way to get either one shipped with an online prescription, we’ve linked the licensed telehealth option below.
1. Simparica vs Bravecto at a glance
| Feature | Simparica (Trio) | Bravecto |
|---|---|---|
| Active ingredient | Sarolaner (+ moxidectin + pyrantel in Trio) | Fluralaner |
| How long one dose lasts | 35 days Monthly | 12 weeks (chew) / 8–12 wks (topical) Longest |
| Species | Dogs only (Simparica & Trio) | Dogs and cats |
| Fleas killed | ✅ Yes (within 3–8 hrs) | ✅ Yes (within 2–12 hrs) |
| Ticks killed | ✅ 5 species | ✅ 4 species (chew), 2 (cat topical) |
| Heartworm prevention | ✅ Only in Simparica Trio | ❌ No — add separate heartworm Rx |
| Intestinal worms | ✅ Hookworm + roundworm (Trio only) | ❌ No |
| Minimum age | 8 weeks, ≥2.8 lb (Trio) | 6 months (chew), 6 mo (cat topical) |
| Prescription required | Yes (Rx) | Yes (Rx) |
| Best for | Dogs needing all-in-one monthly cover | Owners who forget monthly doses; cat households |
2. What each product actually kills
Bravecto coverage
- Adult fleas (Ctenocephalides felis) — starts killing within 2 hours
- Black-legged (deer) tick, American dog tick, brown dog tick, lone star tick
- Cat version (topical) also covers ear mites (Otodectes cynotis)
Simparica Trio coverage (dogs)
- Adult fleas + 5 tick species (adds Gulf Coast tick)
- Heartworm disease (Dirofilaria immitis) via moxidectin
- Roundworms + hookworms via pyrantel
Bottom line on coverage: if you already give a separate heartworm pill (like Heartgard), Bravecto’s 12-week window makes life easier. If you want one monthly chew that does everything, Simparica Trio wins.
3. Simparica vs Bravecto for dogs
For most healthy adult dogs over 6 months, either product will control fleas and ticks reliably. Your decision usually comes down to three questions:
- How often can you remember to dose? — Bravecto = 4 doses/year, Simparica = 12.
- Do you want heartworm in the same chew? — Only Simparica Trio does this.
- Does your dog vomit oral meds? — Bravecto also comes as a topical (Bravecto Plus / Topical for Dogs).
Onset of action (how fast fleas die)
| Time after dose | Simparica Trio | Bravecto Chew |
|---|---|---|
| 2 hours | ~50% fleas dead | ~90% fleas dead |
| 8 hours | >99% | >99% |
| Ticks (48h) | >96% | >98% |
Both are effectively equal by 24 hours. Bravecto edges out on speed of kill in the first few hours, which matters if your dog is currently infested.
4. Bravecto vs Simparica for cats
This one’s short: Simparica is not approved for cats. Zoetis makes a separate cat product (Revolution Plus / Credelio Cat), but Simparica and Simparica Trio are dog-only. If you have a cat and someone recommended “Simparica,” they meant the feline equivalent.
Bravecto is approved for cats in two forms:
- Bravecto Topical Solution for Cats — 12 weeks flea & tick + ear mite protection
- Bravecto Plus (Cats) — adds heartworm + intestinal worm coverage (2 months)
For indoor-outdoor cats and multi-cat households, the 12-week window is a game-changer versus monthly topicals like Advantage or Frontline.
If your cat has flea-triggered anxiety, over-grooming, or scratching, pair the treatment with a vet-formulated calming chew and a gentle skin-support shampoo:
5. Simparica vs Bravecto side effects & safety
Both drugs carry the same FDA class warning for the isoxazoline family (added Sept 2018): possible neurologic reactions including muscle tremors, ataxia, and seizures. In peer-reviewed post-marketing surveillance, the reported rates remain <0.01% of doses dispensed for both products.
| Reported side effect | Simparica Trio | Bravecto |
|---|---|---|
| Vomiting | 1.5% | 7.1% (chew), lower for topical |
| Diarrhea | 2.0% | 4.9% |
| Lethargy | 1.1% | 5.6% |
| Neurologic (rare) | <0.01% | <0.01% |
6. 2026 cost comparison (US average)
| Pack size | Simparica Trio | Bravecto | Cost per month |
|---|---|---|---|
| 3 months (dog 22–44 lb) | ~$88 | ~$62 (1 chew = 3 mo) | Simparica $29 · Bravecto $21 |
| 6 months | ~$168 | ~$120 (2 chews) | Simparica $28 · Bravecto $20 |
| 12 months | ~$310 | ~$225 (4 chews) | Simparica $26 · Bravecto $19 |
Bravecto is ~25–30% cheaper per month — but remember it doesn’t cover heartworm, so add ~$8–$12/mo for a heartworm-only preventive (e.g., Heartgard). Once you do that, the two are roughly equal.
7. Our verdict — which one should you buy?
🏆 Best all-in-one for dogs → Simparica Trio
One monthly chew covers fleas, 5 tick species, heartworm, and intestinal worms. Best for dog owners who want a single Rx to remember.
🛒 Get Simparica Trio (Rx) →🏆 Best long-lasting & only cat option → Bravecto
12 weeks of protection per dose (4 doses a year), works for both dogs and cats, and it’s the go-to pick for busy households that forget monthly doses.
🛒 Get Bravecto (Rx) →💡 Not sure? Book a $0 online vet consult
A licensed vet can review your pet’s history, weight, and lifestyle and issue the right Rx (Simparica, Bravecto, or an alternative like Credelio) shipped to your door within 1–3 days.
🩺 Talk to a Licensed Vet Online →8. Frequently asked questions
Is Bravecto safer than Simparica?
Both are in the same isoxazoline drug class and carry the same FDA class-wide neurologic warning. Peer-reviewed data show the reported adverse-event rates are essentially equivalent (<0.01% neurologic). Bravecto reports slightly higher GI side effects (vomiting, mild diarrhea) in short-term studies; Simparica reports slightly lower. Neither is meaningfully “safer” for a healthy pet with no seizure history.
How long does Bravecto last vs Simparica?
Bravecto chew = 12 weeks. Bravecto topical for cats = 12 weeks. Simparica & Simparica Trio = 35 days (dose monthly).
Can I switch from Simparica Trio to Bravecto?
Yes — most vets recommend giving the next dose on the day the current one would have expired. If switching to Bravecto, you’ll need a separate heartworm preventive since Bravecto doesn’t include it.
Which is better for puppies?
Simparica Trio can be given from 8 weeks and 2.8 lb. Bravecto chew requires 6 months of age. For puppies under 6 months, Simparica Trio (or Credelio) is the standard choice.
Do Simparica or Bravecto kill worms?
Simparica Trio kills roundworms + hookworms (via pyrantel) and prevents heartworm. Regular Simparica and Bravecto do not treat any intestinal worms.
Can I get Simparica or Bravecto without a vet visit?
No — both are prescription-only in the US. The fastest legal route is a licensed telehealth vet who can issue an Rx after a short video/chat consult and ship the product.