What is Cheristin for Cats?


Does your cat constantly scratch its skin and bite on its paws? Have you noticed small and black insects hopping around your cat? If so, your feline friend may have fleas. Not only do they irritate their skin but also suck their blood, making them prone to infections. When left uncontrolled, fleas can multiply and even lay their eggs in carpets, mats, and almost anywhere in and out of your home to access your cat. While there are many products for keeping fleas at bay, some of them might not work instantly. Even if they do, it is not guaranteed to eliminate the fleas’ population. The fleas might come back to infest your cat even no matter how many times you try controlling them. That is where Cheristin for cats comes in handy. Read on to discover how this product works and why it’s a better solution for getting rid of fleas once and for all.

What is Cheristin for Cats?

According to 1800 PetMeds, Cheristin for cats is a topical product that kills and puts fleas’ population under control, protecting your cat against fleas’ infestation. The fast-acting product works by inhibiting fleas’ nervous system, killing them in the process. Once you apply it on the back of the skin of your cat’s skull and neck, it will eliminate the 98-100% fleas in 12 hours. Furthermore, it boasts the capabilities of protecting your cat from fleas in one full month. Unlike other flea control solutions, Cheristin is safe for use on your kitten or cat aged eight weeks and above. The product comes in one, three, six, and twelve packs.

The benefits of Cheristin for cats

1. Instant results

You should see the fleas falling off 30 minutes after the application.

2. Kills 98-100% fleas in 12 hours

One single dose of application kills 98-100% of fleas in 12 hours

3. Killing action continues one full month

A single application of Cheristin for cats kills larvae and fleas one full month, providing instant relief to your cat.

4. Easy to apply

The topical solution is in a tube that works by applying it to the skin at the back of your cat’s skull.

5. It doesn’t grease the cat’s skin

One of the side effects you may expect from Cheristin is clumping on your cat’s hair, but it will dry off once the fleas fall off after dying. However, you should constantly monitor your cat post applying for other side effects that may indicate poisoning from ingestion.

6. Safe on cats and kittens aged eight weeks and above

The topical treatment contains Spinetoram, tough on fleas but gentle on hands for cats aged eight weeks and above, weighing 1.8 pounds.

How to use Cheristin for cats

Applying Cheristin for cats is easy because the dosage requirements and directions for use are indicated on the labels. Follow these steps for maximum effectiveness:

Step 1: Take out the applicator tube from the blister package

The applicator tube has a nozzle that is closed tightly. First, remove it from the blister package after reading the instructions on the label. Use a needle to puncture the nozzle to help you squeeze out the liquid from the applicator tube.

Step 2: Hold the applicator tube in an upright position

The topical treatment is in lotion form, so you must ensure you hold it in an upright position to prevent it from spilling out. Hold it upright to remove the cap. Also, check if opening at the tip of the tube to ensure there is no leakage. Now press the cap down to hear a “click” sound, showing you’ve punctured the tube.

Step 3: Hold your cat in readiness for the application

Some cats are fussy, particularly when they sense that you’re about to apply a foreign substance to their skin. On the other hand, others are calm, depending on how closely bonded they are with their owners. If yours shows signs of nervousness, get someone to hold the cat for you. Next, part the fur on the back of the neck, at the base of the skull, to reveal the skin.

Step 4: Apply the topical treatment to your flea-infested cat

Squeeze out the contents of the topical treatment directly on the cat’s skin. Make sure you squeeze it two to three times to expel the contents of the tube directly on the skin. Hold your cat in a way that prevents the contents from spilling out to your cat’s eyes or mouth. The reason you apply it at the back of your cat’s head is to prevent them from licking the product. Treatment at the base of the head prevents the cat from directly licking it.

Step 5: Dispose of the tube in a trash bin

You may notice that some little residual remains in the tube after administering a full dose. The remaining content isn’t supposed to be used for the next application. Make sure you discard it in a trash bin away from your children or pets.

Step 6: Clean out the dead fleas

Some fleas might stick on your cat’s fur, while others may fall on the floor. First, sweep them off before cleaning your floor with detergent and lukewarm water. Don’t wash your cat before 48 hours of the application of Cheristin. If you have other packs, store them in their original package in a cool, dry place away from the reach of children and animals.

The side effects

Like any other medical product, Cheristin for cats may come with side effects that disappear after a few hours. Monitor your cat for side effects like:

  • Hair loss on the application site
  • Change in fur (clumping, matting, or greasing)
  • Redness, inflammation, or itchiness on the skin
  • Lethargy
  • Vomiting
  • Loss of appetite

These side effects may occur depending on your cat’s breed, immunity, and counteractions with medications they may be taking. Some cats may not experience any side effects, which is no cause for an alarm. If they do, check with your vet to figure out if some contents spilled to their eyes, nose, or mouth.


1. Don’t use it on your dog

Cheristin for cats is designed for cats alone, not dogs. It’s applied externally. Avoid using it on kittens aged less than eight weeks or weighing less than 1.8 pounds. While it’s safe for use on your cats, you must ensure your feline friend doesn’t ingest it.

2. Don’t apply it to pregnant, lactating or cats taking other medications unless your vet approves of it.

If you have a cat weighing more than 20 pounds, consider using more than one single dose. As is expected, use this topical treatment only if your vet examines your cat and approves of it. This applies to pregnant, physically incapacitated, aged, and lactating cats because this category may be sensitive to pesticides. Before applying the product, make sure you read, understand, and follow the instructions on the labels for directions.

3. Make sure it doesn’t spill into your cat’s eyes

Hold them in position if the treatment accidentally spills over to your cat’s eyes. Open their eyes and rinse slowly and gently with water for 15-20 minutes. Meanwhile, it would be best if you put your veterinarian or poison control center on speed dial for a piece of second treatment advice.

4. Make sure your cat doesn’t ingest it

Should your cat ingest the topical products, call a vet immediately. Get someone to give your cat a glass of water if they can swallow. Avoid inducing your cat to vomit unless a poison control center doctor advises you to do so.

5. Store or discard it away from humans and animals

Cheristin for cats is harmful to humans when swallowed. It can also cause mild eye irritation. To protect yourself from the toxicity, wash your hands thoroughly with soap and water after application and before eating, smoking cigarettes, or using the toilet. Make sure it doesn’t come in contact with your eyes or clothing. Also, don’t allow children to apply the product or contact the treated cat until all the application is dry.

Apart from fleas, which other parasites does Cheristin kill cats?

Cheristin is designed to eliminate cats’ fleas, ticks, and ear mites. According to PetCareRX, Cheristin contains an active ingredient called Spinetoram inhibits fleas and ear mites’ nervous system, causing them to die instantly in just 30 minutes. It actively kills fleas for 4-6 weeks to protect your cat from fleas, though you only need a monthly application. But if you want to kill ear mites, use the product constantly for more than three months.

What should I do if my cat accidentally ingests Cheristin?

Cats are professional lickers, particularly if a foreign object or substance penetrates their skin. The good news is that Cheristin is applied at the back of your cat’s head, which is the most inaccessible part to lick. However, they can still use their front paws in an attempt to wipe off the topical treatment. Should this happen, little contents of Cheristin may find their way into your cat’s digestive system. You will know your cat is reacting to toxicity from Organophosphates when they drool, become lethargic, have muscle spasms, respiratory problems, vomiting, and diarrhea within an hour to twelve hours. If you notice these signs, schedule an appointment with your vet immediately.

Can I use Cheristin if my cat is under other medications

According to Elanco Pet Health, Cheristin and other medications don’t have any interactions. However, it’s advisable to check with your vet if it’s okay first to remove any doubts you may have.

Is Cheristin available over-the-counter?

Yes. You can buy Cheristin over-the-counter from selected pharmacies without getting a prescription from your vet. Remember to check with your vet first if your cat is pregnant, lactating, or taking other prescriptions before administering this treatment.

What if I have cats that groom each other?

Cats grooming each other after Cheristin’s application increases the possibility of poisoning between them. It would be best if they get separated for at least 48 hours to protect them against poisoning.

Is Cheristin recommended for newborn kittens?

No, don’t apply this topical treatment on kittens under eight weeks or weighing less than 1.8lbs as its potency is too strong for them. It’s a low-volume and one-size-fits-all topical solution for cats and kittens aged eight weeks and above. If you have kittens below that age, it’s best to wait until they come off age.

What should you do next if fleas still appear on your cat despite applying Cheristin?

Ideally, a single application of Cheristin should eliminate 98-100% fleas on your cat in 30 minutes. If you still see them on your cat, then that means the topical treatment only killed the adult fleas on your cat. Most probably, adult fleas in your cat’s environment haven’t come into contact with your cat. Sometimes, it can take weeks or even months for a flea’s larvae to come out and grow into adults. Cheristin works by eliminating adult fleas before they lay their eggs, disrupting their life cycle. If you have more than one cat, make sure you treat all of them to prevent re-infestation. Applying the topical treatment on your carpet or furniture isn’t a must to get rid of fleas hiding inside them. The low-volume dosage works effectively if you consistently apply it to your cat(s), guaranteeing maximum flea control.

Can I apply Cheristin for cats on my dog?

No. According to US EPA, Cheristin for cats doesn’t work on dogs. It contains 11.2% Spinetoram that naturalizes, attacks, and incapacitates common fleas infesting cats alone. So, if your dog also has fleas, liaise with your vet to recommend the safest and most effective flea control solution for them.


Cheristin is an excellent topical treatment for killing fleas, disrupting their lifecycle. The low-volume dose instantly eliminates 98-100% fleas in 30 minutes, and the killing action continues for 4-6 weeks, giving your cat the instant relief they desire. Before applying this product to your cat, talk with your vet to get an okay if it’s safe to do so.

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