Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Comfortis Flea Tablet for Cats – Vet Review in 2026

Share

Comfortis Flea Tablet Review

Review Summary

Our Final Verdict

We give Comfortis Flea Tablet a rating of 4.5 out of 5 stars.

Effectiveness: 4.9/5
Ease of use: 3.5/5
Pet acceptance: 3.5/5
Flavor: 4/5
Size of tablet: 2/5
Value: 4/5

If you have a cat, especially one that goes outdoors, you’ll want to keep them free of fleas. There are lots of products available when it comes to flea-preventative treatments, including spot-ons, sprays, and tablets. Comfortis is a flea tablet containing Spinosad made by Elanco Animal Health.

Comfortis flea tablets are helpful for cats who develop skin irritation when topical treatments are applied or when other products seem to be less effective. Comfortis is a good choice for cats who have flea-bite allergies. If you can give your cat tablets, Comfortis tablets are very effective at controlling fleas.

Comfortis is a chewable, beef-flavored tablet, making it more palatable for cats. This means some cats will take it as a treat without a fuss. However, many cats might still need a bit of persuasion, and you might end up trying to disguise the tablet in something tasty. Therefore, this might not be the best choice for cats who are tricky to handle or for cats who find it impossible to give pills.

divider 2 cats

Comfortis Flea Tablet for Cats – A Quick Look

Pros
  • Chewable and palatable tablets can be easier to get your cat to take
  • Tablets can be crushed or disguised in small amounts of food
  • Convenient to use and minimal mess
  • Very effective at killing and preventing fleas
  • Flea-killing action lasts a month
  • Starts working in just 30 minutes
  • No chemicals on the skin or fur, so there is no risk to furniture, other pets, or other family members
  • There is no risk of the medication washing off as with sprays and spot-on treatments
  • Licensed veterinary product is tried, tested, and proven safe and effective
Cons
  • Not all cats will take tablets with ease, even when they are palatable
  • For treatment to be effective at preventing fleas, a tablet must be given every month
  • Current flea infestations may take three months of treatment to resolve
  • Quite expensive compared to other flea treatments
  • Not safe for use in pregnant or lactating cats
  • Only available from your veterinary clinic or with a prescription

Comfortis Flea Tablet for Cats Specifications

Brand name: Comfortis
Drug name: Spinosad
Manufacturer: Elanco Animal Health
Medication form: Tablet
Target species: Cats and dogs
Type of tablet: Chew
Flavor: Beef
Size of tablets (for cats): 140 mg, 270 mg, 560 mg
Time until effective: 30 minutes
Treatment lasts: 1 month
Suitable for: Cats over 14 weeks of age
Not suitable for: Cats who are pregnant or lactating
Possible side effects: Vomiting, diarrhea, reduced appetite, lethargy, weight loss
Not to be given with: Off-license doses of Ivermectin

Beef-Flavored and Chewable Tablets

It’s not always easy to give your cat medication, and for some owners, the idea of giving their cat a tablet fills them with dread. Other owners might feel their stress levels rising as they look at the calendar and see the date of their cat’s next spot-on approaching. Because Comfortis flea tablets are beef-flavored and chewable, they are more likely to be accepted by your cat as a treat. This takes away the hassle and stress of keeping your cat free from fleas by providing a quick and convenient treatment.

Quick-acting and Lasting Effect

You might think that giving a flea tablet won’t kill your cat’s fleas as quickly as a topical treatment like a spray or spot-on. However, Comfortis flea tablets for cats effectively kill fleas as early as 30 minutes after treatment. This effect isn’t short-lived either, with Comfortis continuing to kill fleas for a month after treatment.

No chemicals to rub off or cause damage

When you apply a spot-on or a spray flea treatment, it can wash off in the rain or get licked off during grooming. It can even rub off on your furniture or upholstery. These chemicals could harm any pets or children who ingest them and cause damage to your furniture. In addition, if some of the treatment has rubbed off, your cat might not receive the necessary dose. The benefit of giving your tablet a cat is that your cat gets the entire dose with no risk of the chemicals going anywhere they shouldn’t.

Flea Tablet Price

Although Comfortis flea tablets for cats are at the higher end in terms of price compared to other flea treatments, they do offer good value. Comfortis has a veterinary license, so it is proven to be effective. It’s also very quick, and its action continues for a month after treatment.

Tablets Aren’t for Everyone

Despite the tablets being palatable, flavored, and chewable, not every cat will take pills. If your cat is a bit of a detective and manages to find medication in even the strongest smelling and tastiest disguise, you might find that Comfortis is not for you. After all, it can only be effective if you can get it into your cat!

divider 2 cats

FAQ: Comfortis Cat Flea Tablets

 

Is Comfortis safe for cats?

Comfortis is a safe and effective flea treatment for cats. Like any medication, it can occasionally cause side effects in a small number of patients, but this is uncommon, and the side effects are usually mild. Side effects that your cat might show following treatment with Comfortis include vomiting, diarrhea, lethargy, reduced appetite, or weight loss.

Is Comfortis a good flea treatment for cats?

Yes, Comfortis flea tablets for cats are often easier to give than other tablets due to their beef flavor and chewable form. The tablet is effective from 30 minutes after treatment, and it continues killing fleas for a month.

How do you give a cat Comfortis?

There are three sizes of Comfortis tablets used in cats and these are 140 mg, 270 mg, and 560 mg. The size your cat needs will depend on their body weight. The tablet should be given by mouth once a month and should ideally be given in food.

cat being fed a cat treat or cat food by hand
Image Credit: Jakub Zak, Shutterstock

What the Users Say

We’ve looked at review sites and forums to provide a summary of what some pet owners think of Comfortis flea tablets.

Here are some of the positive points that we found:
  • Many users are pleased with how effective Comfortis flea tablets are. Many have moved onto Comfortis treatment after other products have seemed to become ineffective. Some users have found it to be the only way to keep their cats with flea allergies from having flare-ups.
  • As mentioned previously, Comfortis flea tablets are flavored and palatable, and many users have noted that they find it easy to give Comfortis to their cats.
  • Users have commented that they are pleased with how quickly Comfortis has worked. Some have mentioned being unable to find any fleas after just 1 or 2 days.
However, we also came across some less positive feedback from users of Comfortis:
  • As explained above, not every cat will take tablets easily, even if they are palatable. Many cat owners have commented that their cat doesn’t like the taste or they struggle to give the tablet.
  • Some reviewers commented that the tablets would be better if they were smaller in size. They have found that the pills are too large to give to their cat easily.
  • Many user reviews have commented on side effects, especially vomiting, with some saying that their cats vomit after every dose.
  • Others mention more serious potential side effects or reactions. However, as a licensed veterinary medication, all adverse reactions are reported back to the drug company and the medical licensing authority (the FDA in the US). All side effects are investigated thoroughly, and no unsafe medication would remain licensed.

divider 2 cats

Conclusion: Comfortis for Cats Review

In conclusion, Comfortis flea tablets for cats are a fast and effective treatment for fleas if your cat will take them. Their beef flavor and chewable texture are often better accepted than some other tablets. However, not every cat and cat owner will find them an easy option. Comfortis will start killing fleas after just thirty minutes and remains effective for a month, so although it isn’t cheap, it’s certainly good value for money.

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Catster's Digital Magazine is Back!

Vet-approved health & behavior advice

Real cat stories & community features

A Paw-sitive Milestone: Canada Officially Becomes a Declaw-Free Nation

Canada has officially become a declaw-free nation. On May 25, 2026, a new regulation was filed in Ontario under the Provincial Animal Welfare...

The Surprisingly Simple Ways to Help a Cat With Hairballs

Cats spend an astonishing amount of time grooming. It is part hygiene routine, part comfort ritual, and part instinct that traces back generations....

What a CATastrophe! A Tire-ing Ordeal For a Pony in the UK

As you would expect, our weekly news updates are usually centered around feline topics – we are a cat care website after all...

Ask Dr. Paola – Help! My Cat Has Stopped Eat His Wet Food! (June 1, 2026)

Welcome to our “Ask Dr. Paola” series, where every Monday we bring expert advice straight from Dr. Paola Cuevas (MVZ) to help our...

More related

Why Do Dogs Chase Cats? Myths, Possible Causes & Vet-Approved Solutions

Dogs most often chase cats because they have a natural prey drive, which means they will chase any smaller animal that runs. It...

Can Cats Get Addicted to Catnip? Vet Approved Facts & FAQ

If you have a cat or two, you’ve probably heard about catnip, which is a plant that cats seem to enjoy more than...

Will Climb for Tuna: We Chat With Animal Planet’s “Canopy Cat Rescue” Team

At Canopy Cat Rescue, the team wants the cat in the bag — namely, the tough rescue sack used to transport felines from...

“Kedi” Is a Gorgeously Vexing View of Istanbul’s Street Cats

The film, Kedi introduces us to a big family with many pets. The family, in this case, is the human population of Istanbul,...

Keep reading

Feliway Cat Diffuser Review in 2026: Recalls, Pros & Cons

Review Summary It can be upsetting for us humans to see our cats distressed or unhappy. Cats are sensitive creatures, so if you’ve recently moved or made a large life change, you may have noticed this having a negative effect...

Feliway Pheremone Diffuser Review

Are Cats Playful? Vet-Reviewed Feline Character Explained

Absolutely, most cats love to play! However, cats vary a lot in temperament depending on their breed, gender, and other factors. Some breeds are particularly known for being playful, like the Bombay, while others are known for not being playful....

Two cats are lying on the floor. Gray cats are playing with a laser pointer.

Bugs in Your Cat Litter Box? Vet-Approved Cleaning & Prevention Tips

Removing your cat’s poop and pee from their litter box is one thing, but when it comes to finding nasty little bugs in there, it can be too much for a cat parent to bear! What are these tiny insects,...

Cat with Litter Box

Why Does My Cat Have Bumps on Their Skin? 8 Common Reasons

It can be scary to notice a lump on your cat’s skin. Immediately, your mind rushed to the worst-case scenario—but don’t jump to conclusions yet! There are plenty of reasons that your cat may have a bump on their skin...

female veterinarian examining cat on the table

Why Does My Cat Steal Things From Me? 10 Vet-Reviewed Assumptions

As cat owners, we know our felines are capable of many strange behaviors, but one of the weirdest has to be when they steal things from us and hide them away. Many cat parents have stories about their pets stealing...

maine coon cat with toy in his mouth

Cat Spraying vs Peeing: Vet-Verified Differences

Dealing with your cat peeing inappropriately in your home can be exceedingly frustrating. Many cat owners don’t realize there’s a difference between your cat peeing and spraying. While it may not seem like it, the distinction is important because several...

How Long Does It Take a Domestic Cat to Go Feral? Vet-Reviewed Facts

If you’ve ever had a pet cat that’s gotten lost or stolen, you may wonder what became of them. Did they find a community of other cats and become feral? Are they living happily with another family somewhere? While we...

feral cat with ear tip clipped

Vet Checklist: What to Bring to Your Cat’s First Visit (Vet-Approved)

Owning a cat is a huge responsibility. In addition to giving excellent care at home, you must also schedule regular vet visits to keep your cat healthy. If your cat’s first vet visit is approaching, the time to prepare is...

veterinarian giving cat's medical record to it's owner

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.