How Long Do Side Effects of Revolution Last in Cats?

Revolution is a popular topical medication used to protect cats against a range of parasites, including fleas, ticks, ear mites, and certain types of worms. While it is generally safe and effective, like any medication, Revolution can occasionally cause side effects in cats. It’s important for cat owners to understand these potential side effects and how long they may last.

Common Side Effects of Revolution in Cats:

1. Mild skin irritation: Revolution may cause some cats to experience mild skin irritation at the site of application. This usually subsides within a few hours or days.

2. Hair loss: In rare cases, cats may experience temporary hair loss at the application site. This typically regrows within a few weeks.

3. Vomiting: Some cats may experience mild vomiting shortly after application. This is usually temporary and resolves on its own.

4. Salivation: Revolution can sometimes cause excessive salivation in cats, which usually subsides within a few hours.

5. Diarrhea: Although uncommon, some cats may experience diarrhea after receiving Revolution. This usually resolves within a day or two.

6. Lethargy: Cats may feel a bit tired or lethargic for a short period after application. This is typically temporary and should improve within a day or two.

7. Muscle tremors: In rare cases, cats may experience muscle tremors or twitching after receiving Revolution. If this occurs, consult your veterinarian.


1. How long do these side effects typically last?
Most side effects of Revolution in cats are temporary and should resolve within a few hours to a few days.

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2. Can Revolution cause long-term side effects?
Serious long-term side effects from Revolution are extremely rare.

3. What should I do if my cat experiences side effects?
Monitor your cat closely and contact your veterinarian if the side effects persist or worsen.

4. Can I give Revolution to my pregnant cat?
Revolution is generally safe for pregnant and lactating cats but consult your veterinarian before using it.

5. Can Revolution be used on kittens?
Revolution is safe for kittens as young as 8 weeks old. Follow dosing instructions carefully.

6. How often should I apply Revolution to my cat?
The frequency of application depends on the specific parasite protection needed. Follow the instructions provided by your veterinarian.

7. Can Revolution be used on other pets?
Revolution is specifically formulated for cats and should not be used on dogs or other animals unless directed by a veterinarian.

8. Can Revolution be used alongside other medications?
Consult your veterinarian before combining Revolution with other medications to avoid potential interactions.

9. Can Revolution cause allergic reactions in cats?
While rare, cats can develop an allergic reaction to Revolution. Watch for signs such as itching, swelling, or difficulty breathing.

10. Are there any precautions I should take when applying Revolution?
Avoid contact with your skin and eyes when applying Revolution. Wash your hands thoroughly after application.

11. How quickly does Revolution start working?
Revolution begins killing fleas within 36 hours of application and continues to protect against parasites for about a month.

In conclusion, Revolution is generally well-tolerated by cats, with most side effects being mild and temporary. It is crucial to carefully follow the dosing instructions provided by your veterinarian and monitor your cat for any adverse reactions. If you have any concerns or questions about Revolution and its potential side effects, consult your veterinarian for guidance and reassurance.

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