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How Long Does Revolution Take to Kill Fleas?

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Revolution, a popular flea treatment for dogs and cats, has been a game-changer for many pet owners struggling with flea infestations. It’s quick, efficient, and offers long-term relief from these pesky parasites. But exactly how long does Revolution take to kill fleas? Let’s delve into this question and provide an all-in-one guide to everything you need to know about Revolution and flea control.


Revolution begins to work against fleas within 12 hours of application, killing over 98% of fleas on your pet within 24 hours. However, the total time to completely eliminate a flea infestation can vary based on several factors, including the stage of the flea life cycle, the presence of fleas in the environment, and the frequency of application. For optimal results, Revolution should be administered at monthly intervals throughout the flea season.

What is Revolution?

Revolution is a topical treatment for pets that uses the active ingredient Selamectin. This macrocyclic lactone compound targets the nervous system of parasites, causing an electrolyte imbalance that results in their paralysis and eventual death. It’s absorbed quickly into the pet’s bloodstream, skin, and hair, effectively killing adult fleas and preventing flea eggs from hatching.

How Quickly Does Revolution Act?

Revolution starts working against fleas within 12 hours of application and kills over 98% of fleas within 24 hours. In cases where the pet is already infested with fleas, the first dose of Revolution kills adult fleas on the animal and prevents viable fleas from hatching from eggs.

Factors that Affect the Speed of Flea Elimination

Several factors can influence how quickly Revolution kills fleas. These include the stage of the flea life cycle, the presence of fleas in the environment, the frequency of application, the pet’s individual response to the treatment, and the proper application of the product.

For optimal results, Revolution should be administered at monthly intervals throughout the flea season, starting one month before fleas become active.

Long-Term Efficacy of Revolution

In controlled laboratory studies, more than 98% of fleas were killed within 36 hours. Clinical field studies demonstrated over 90% control of flea infestations within 30 days of the first dose. However, an environmental infestation of fleas may persist for a short time after beginning treatment with Revolution due to the emergence of adult fleas from pupae.

Side Effects and Risks of Using Revolution

While Revolution is generally safe, there are potential side effects and risks associated with its use. These can include temporary hair loss at the site of application, loss of appetite, drooling or vomiting, bloody stools or diarrhea, irritation or redness at the application site, lethargy or drowsiness, hyperactivity, and muscle tremors. Always consult your veterinarian if you notice any adverse reactions in your pet after using Revolution.

Using Revolution with Other Flea Control Methods

Before combining Revolution with other flea control methods, always consult with your veterinarian. Mixing different flea control products or using them simultaneously may lead to adverse effects or decreased efficacy.

Final Thoughts

Revolution is an effective solution for flea control, but it’s important to remember that each pet is unique. What works well for one pet may not be as effective for another. Always consult with a veterinarian before starting any new treatment plan for your pet. And remember, consistency is key. Regular, monthly applications of Revolution will provide the best results in controlling and preventing flea infestations.

Frequently Asked Questions

Can I use Revolution for dogs on cats or vice versa?

No, Revolution is specifically formulated for different species and weight ranges. Using the wrong product could lead to overdosing or underdosing. Always use the appropriate product for your pet’s species and weight.

Is Revolution safe for pregnant or nursing pets?

Yes, Revolution has been tested and found to be safe for use in pregnant and nursing dogs and cats. However, it’s always best to consult with your veterinarian before starting any new treatment.

Can I bathe my pet after applying Revolution?

Yes, but you should wait at least two hours after application to allow the product to be absorbed into the skin. After that, occasional bathing should not affect the efficacy of the product.

Can I use Revolution on a young puppy or kitten?

Revolution can be used on puppies and kittens as young as 6 weeks old. However, always consult with your veterinarian before starting any new treatment plan for your pet.

How should I store Revolution?

Revolution should be stored in a cool, dry place out of direct sunlight. The product should also be kept out of reach of children and pets.

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