Revolution Plus and NexGard COMBO are the two most widely prescribed monthly topical parasite preventives for cats in the United States. Both are prescription-only, both are applied to the skin once monthly, and both cover heartworm disease, fleas, and several internal parasites. But they differ in active ingredients, tick species coverage, tapeworm handling, minimum weight thresholds, and isoxazoline-class safety considerations.

This article compares the two products based on their FDA-approved labels, explains where each has a genuine clinical advantage, and identifies the cat profiles that favor one over the other.

Quick answer

Both products prevent heartworm disease, kill fleas, and treat roundworms and hookworms. The practical differences come down to:

Neither product is universally better. The right choice depends on the individual cat's parasite exposure, tick pressure in the region, tapeworm history, and neurologic history.

What each product contains and how it works

Revolution Plus (Zoetis)

FDA-approved under NADA 141-502. Each dose contains selamectin (a macrocyclic lactone) and sarolaner (an isoxazoline). Selamectin is absorbed systemically after topical application and provides heartworm prevention, treats and controls roundworms (Toxocara cati) and hookworms (Ancylostoma tubaeformae), treats ear mites (Otodectes cynotis), and kills fleas. Sarolaner provides the flea-killing boost and tick coverage.

The labeled minimum dose is 2.7 mg/lb (6 mg/kg) selamectin and 0.45 mg/lb (1 mg/kg) sarolaner. Available in three weight-based sizes: 2.8–5.5 lbs, 5.6–11 lbs, and 11.1–22 lbs.

NexGard COMBO (Boehringer Ingelheim)

FDA-approved under NADA 141-570. Each dose contains three active ingredients: esafoxolaner (an isoxazoline), eprinomectin (a macrocyclic lactone), and praziquantel (a cestocide). Eprinomectin handles heartworm prevention and internal parasites, esafoxolaner kills fleas and ticks, and praziquantel directly treats tapeworm (Dipylidium caninum) infections.

The labeled minimum dose delivers 0.65 mg/lb (1.44 mg/kg) esafoxolaner, 0.22 mg/lb (0.48 mg/kg) eprinomectin, and 4.53 mg/lb (9.98 mg/kg) praziquantel. Available in two sizes: 1.8–5.5 lbs and 5.6–16.5 lbs, with a combination dose for cats 16.6–33 lbs.

Parasite-by-parasite comparison

Heartworm disease prevention

Both products are labeled for prevention of heartworm disease caused by Dirofilaria immitis. In a laboratory effectiveness study submitted for FDA approval, NexGard COMBO was 100% effective in preventing development of heartworms in cats inoculated with infective larvae 30 days prior to the first of three consecutive monthly treatments.

Revolution Plus has a long heritage from the original Revolution (selamectin-only) product, with over 25 years of clinical use in heartworm prevention for cats. The label states that the addition of sarolaner does not interfere with selamectin's heartworm prevention activity, and the product can be safely used in heartworm-positive cats.

Bottom line: Both are effective heartworm preventives for cats. Neither treats existing adult heartworm infections.

Fleas

Both products kill adult Ctenocephalides felis fleas and are labeled for treatment and prevention of flea infestations. Revolution Plus uses dual action — both selamectin and sarolaner kill fleas — while NexGard COMBO relies on esafoxolaner as the primary flea-killing ingredient with eprinomectin providing additional activity.

Bottom line: Both are effective against fleas. Neither has a clearly superior label claim for speed of kill or residual flea activity.

Ticks — where the biggest label difference lives

This is the category where the products diverge meaningfully.

Revolution Plus is labeled for treatment and control of four tick species:

• Black-legged tick (Ixodes scapularis)
• Lone star tick (Amblyomma americanum)
• Gulf Coast tick (Amblyomma maculatum)
• American dog tick (Dermacentor variabilis)

NexGard COMBO is labeled for treatment and control of two tick species:

• Black-legged tick (Ixodes scapularis)
• Lone star tick (Amblyomma americanum)

For cats in regions with heavy Gulf Coast tick or American dog tick pressure — the Southeast, Gulf states, and parts of the Midwest — Revolution Plus provides broader labeled tick coverage. A veterinary dermatologist quoted in Business Insider's 2026 flea-and-tick guide noted that Revolution Plus tends to be more effective for tick control in areas with heavy tick populations.

Bottom line: Revolution Plus has broader tick coverage by label. For cats in tick-endemic areas with species beyond black-legged and lone star ticks, this is a clinically meaningful difference.

Tapeworms — different mechanisms

NexGard COMBO contains praziquantel and is directly labeled for treatment and control of Dipylidium caninum (flea tapeworm) infections. Praziquantel kills existing tapeworms.

Revolution Plus does not contain a cestocide. Its label states it helps prevent tapeworm infections as a result of killing the vector fleas (Ctenocephalides felis) on the treated cat — it interrupts the transmission cycle rather than treating an established infection. Zoetis notes that if a cat on Revolution Plus tests positive for tapeworms, the company will provide reimbursement for an approved tapeworm treatment.

For cats that hunt and eat prey (especially rodents), tapeworm exposure goes beyond Dipylidium caninum to include Taenia taeniaeformis. Neither product has a label claim against Taenia species in cats. Cats with active hunting behavior may need periodic praziquantel regardless of which preventive they receive.

Bottom line: NexGard COMBO directly treats active tapeworm infections. Revolution Plus prevents them by killing vector fleas but does not treat existing infections.

Ear mites

Revolution Plus is labeled for treatment and control of ear mite (Otodectes cynotis) infestations.

NexGard COMBO is not labeled for ear mites.

For cats with recurrent ear mite issues — common in outdoor cats and multi-cat environments — this is a real advantage for Revolution Plus.

Bottom line: If ear mite treatment is a priority, Revolution Plus is the only one of the two that covers it.

Roundworms and hookworms

Both products treat and control roundworms (Toxocara cati) and hookworms (Ancylostoma tubaeformae). NexGard COMBO additionally covers Ancylostoma braziliense on its label.

Bottom line: Largely equivalent for routine roundworm and hookworm coverage.

Weight and dosing differences

The minimum weight threshold matters for very small kittens:

• Revolution Plus: 2.8 lbs minimum
• NexGard COMBO: 1.8 lbs minimum

For small-breed kittens under 2.8 lbs, NexGard COMBO can be used at 8 weeks if the kitten weighs at least 1.8 lbs, while Revolution Plus requires waiting until the kitten reaches 2.8 lbs. This gap may matter in shelters and foster situations with very young or small kittens.

On the upper end, NexGard COMBO's label extends to 33 lbs with a combination dose, while Revolution Plus covers up to 22 lbs with a single tube and may require two tubes for larger cats.

Isoxazoline safety considerations

Both products contain an isoxazoline-class ingredient: sarolaner in Revolution Plus, esafoxolaner in NexGard COMBO. The FDA has issued a fact sheet warning that isoxazoline products have been associated with neurologic adverse reactions including tremors, ataxia, and seizures in animals with or without a history of neurologic disorders.

Both product labels carry this warning. For cats with a known seizure history or neurologic disease, either product should be used with caution, and the decision should involve a conversation with the veterinarian about whether a non-isoxazoline preventive (such as Revolution, which contains only selamectin) is more appropriate.

Reported side effects in Revolution Plus clinical trials included lethargy and anorexia. NexGard COMBO field studies reported vomiting (6.56%), application-site hair change (3.69%), anorexia (2.87%), and lethargy (2.46%).

Neither product's safety has been evaluated in breeding, pregnant, or lactating cats.

Which cat fits which product

No single product is right for every cat. Here is how the clinical logic breaks down:

Choose Revolution Plus when:

• The cat lives in a region with Gulf Coast ticks or American dog ticks
• Ear mite treatment is needed alongside routine prevention
• The cat has no history of seizures and needs broad external parasite coverage
• The practice already stocks the Zoetis ecosystem and the veterinary team is familiar with the product

Choose NexGard COMBO when:

• The cat is a very small kitten (1.8–2.7 lbs) that needs immediate protection
• The cat has a history of active tapeworm infections or hunts frequently
• The cat lives in a region where black-legged and lone star ticks are the primary concern
• Direct tapeworm treatment without an additional medication is preferred

Consider neither and look at alternatives when:

• The cat has a seizure history or active neurologic disease — discuss non-isoxazoline options like Revolution (selamectin only) or Advantage Multi (imidacloprid + moxidectin) with your veterinarian
• The cat is pregnant or lactating — safety has not been established for either product

What to ask your veterinarian

1. What tick species are active in our area? If Gulf Coast or American dog ticks are present, Revolution Plus has the label advantage.
2. Does my cat need ear mite coverage? If yes, Revolution Plus includes it.
3. Has my cat had tapeworms before or does my cat hunt? If yes, NexGard COMBO's praziquantel provides direct treatment.
4. Is my kitten's weight above 2.8 lbs? If not, NexGard COMBO can be used at 1.8 lbs minimum.
5. Does my cat have any neurologic history? If yes, both products require caution, and a non-isoxazoline alternative may be more appropriate.

Sources

• Revolution Plus (selamectin and sarolaner) FDA Label — DailyMed: https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=cbcc7b04-f3ab-4f3e-a38f-dcdc313e1b8a
• NexGard COMBO (esafoxolaner, eprinomectin, praziquantel) FDA Label — DailyMed: https://dailymed.nlm.nih.gov/dailymed/fda/fdaDrugXsl.cfm?setid=48dd3eaa-18e3-430d-ad40-a964b591fb16
• NexGard COMBO Full Prescribing Information — Boehringer Ingelheim: https://docs.boehringer-ingelheim.com/NexGard%C2%AE%20COMBO%20%28esafoxolaner%2C%20eprinomectin%2C%20and%20praziquantel%20topical%20solution%29.pdf
• Revolution Plus Prescribing Information — Zoetis: https://www.zoetisus.com/_locale-assets/pdf/revolution-plus-prescribing-information.pdf
• FDA Corrected FOI Summary for NADA 141-570 (NexGard COMBO): https://animaldrugsatfda.fda.gov/adafda/app/search/public/document/downloadFoi/13855
• FDA Isoxazoline Fact Sheet for Pet Owners and Veterinarians: https://www.fda.gov/animal-veterinary/animal-health-literacy/fact-sheet-pet-owners-and-veterinarians-about-potential-adverse-events-associated-isoxazoline-flea
• Business Insider — Best Flea and Tick Treatments for Cats 2026: https://www.businessinsider.com/guides/pets/best-flea-prevention-cats
• CAPC Parasite Guidelines: https://capcvet.org/guidelines/
• Zoetis Revolution Plus Product Page: https://www.zoetispetcare.com/products/revolution-plus