PetArmor® CAPACTION® (nitenpyram) Oral Flea Treatment for Dogs - 6 / 2-25lbs

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4.2 from 33,928 reviews

365K+ sold

PetArmor CAPACTION (nitenpyram) Oral Flea Treatment for Dogs — 2–25 lbs, 6 Tablets

Name: PetArmor® CAPACTION® (nitenpyram) Oral Flea Treatment for Dogs - 6 / 2-25lbs
Brand: PetArmor
SKU: Y2R865B56
Price: 31.49 USD
Availability: InStock
Rating: 4.18 (33928 reviews)

When fleas show up on your dog, this oral tablet gets to work fast — it starts killing adult fleas within 30 minutes. Available without a prescription and offered in weight-based options, CAPACTION is a simple first step for new flea-treatment buyers.

$31.49

Key Features

•

Starts killing adult fleas within 30 minutes of a single oral dose

•

Sized for smaller dogs weighing 2 to 25 lbs

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Contains nitenpyram, the same active ingredient found in CAPSTAR

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Give as often as once a day if fleas return; safe for pregnant or breeding dogs, as directed

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Easy oral tablet — no messy topical to rub in, and no prescription needed

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Includes 6 doses to kill adult fleas that can trigger flea allergy dermatitis

Count

Weight

> 25lbs

2-25lbs

Free shipping

Delivers in 2-3 days

30-day free returns

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Customer confidence

365K+ recently bought this product

Top seller

99% of customers keep this item

Low return rate

Over 365K+ happy customers

It DOES work!

Worth every penny. My dog has been infested with fleas. Tried everything, including yard treatments. Buy it! Worth it.

Abby

A Must Have Flea Product

I keep PetArmor CAPACTION oral flea treatment tablets on hand to administer in that situation. None of my dogs have experienced side effects. I highly recommend this product.

Mary Rae Fouts

Dogs love it!

I use this product often because I have 6 dogs. Perfect if a dog has a lot of fleas. Good price, quick delivery and comes with qty 6, so 1 for each of my dogs.

Andrew

A smiling woman kneels on a sunny lawn and pets a content golden retriever lying in the grass beside her, with trees and blue sky behind them.

Fast-acting relief

Fleas gone fast, without the guesswork

Fleas can turn up quickly. CAPACTION is an oral tablet that starts killing adult fleas within 30 minutes, so relief begins the same day you notice a problem — no waiting and no mess to rub in.

How it works

One oral tablet that targets adult fleas

CAPACTION contains nitenpyram, the same active ingredient as CAPSTAR. You give it by mouth, and it goes to work on the adult fleas already on your dog. It can be given as often as once a day if fleas come back — always use as directed.

A hand holds out a small round chewable tablet to a fluffy black-and-white Bernedoodle lying on a wood floor and licking its lips.

A smiling woman kneels on a front walkway lined with blooming flowers and pets a brown labradoodle wearing a leather collar and leash.

New to flea treatment?

A simple first choice you can trust

If this is your first flea treatment, we kept it straightforward. Choose the option that matches your dog's weight, give one tablet, and know what to expect. Available without a prescription, CAPACTION is an easy way to tackle an active adult-flea problem.

Trusted by dog owners for fast flea relief

Advocacy

84%

Of customers have recommended us to a friend or family member.

Satisfaction

75%

Of customers gave us positive customer satisfaction scores.

Source: Stackline data, September 2026

How We Stack Up

CAPACTION oral tablets

Topical spot-on treatments

Flea collars

Start killing the adult fleas on your dog the same day

Give it by mouth — nothing to rub onto skin or fur

Match the dose to your dog's weight range

Buy it without a prescription

Re-dose as often as once a day if fleas return

Simple and mess-free for an active flea problem

A woman leans down to pet a leashed brown labradoodle sitting by the front door of a farmhouse-style porch decorated with flowers and a vintage milk can.

Relief that starts fast

Spot fleas today, act today. CAPACTION starts killing adult fleas within 30 minutes of a single oral dose, so your dog gets relief the same day.

A hand holds up a small white tablet beside a cream long-haired dachshund sitting on a beige couch and looking toward the camera.

Easy to give, easy to trust

It's an oral tablet — no messy topical to rub in or dry. Use as directed, and give as often as once a day if fleas come back.

A smiling woman sits on a beige couch and pets her large black-and-white Bernedoodle, which rests its head on her lap in a bright living room.

An option sized for your dog

Choose by weight — options for dogs 2 to 25 lbs and for dogs over 25 lbs, in 6- or 12-tablet packs — so you can pick what fits your dog and your needs.

Frequently Asked Questions

PetArmor® CAPACTION® is an oral flea treatment for dogs. Its active ingredient is nitenpyram, and it kills adult fleas. Choose the dog option that matches your pet's weight and follow the package directions.

4.2 Star Rating

Discover why customers choose us

We've collected over 33,928 reviews from shoppers on our website and major retailers.

All

Effectiveness

Value for money

Price

Fast acting

Alyssa aguilar

May 18, 2025

Highly recommend for a temporary solution!!

Package came a little bent but I assume that’s because of how flat the box is. Medication kicked in about 30-40 minutes and I immediately started seeing the fleas come off. Not specifically sure how the medication works but to me it very much made the fleas “drunk” to where they would fall off and eventually die.Like I said, temporary fix till I can get my dog to the vet to get him Trifexis. Really enjoyed the popping the drink fleas!

Yuri

Jun 10, 2024

It works

Having just received medication today, I gave it to her around 6pm, and within 30 minutes she started acting crazy. There were fleas running all over her body waiting to come out. She was itching like crazy. As she scratched, dead and alive fleas jumped out. I also helped her get some off with a comb. I got a plastic cup with water and threw about two cups full of fleas into it. As an indoor dog, she only goes out for the restroom occasionally, but she does escape, and that's how she gets fleas, especially from stray cats roaming around our neighborhood. It is hoped that fleas will disappear soon. It must be given to her by a Winnie, the taste she hates. I really hope this helps my poor baby, she's been scratching for days, she's going bald.

Brittany franks

Aug 27, 2026

Oral flea treatment !

This is the only flea meds I’ll buy for my furry kids. They really work start working within 30 minutes I give them a bath an hour after getting meds. It works wonders. Simple to use. I put it in peanut butter, as my dogs are stubborn. No side affects for my animals and it reduces the fleas by 90%! Very much in love with this brand and very pleased to keep buying !

Bee

Aug 3, 2026

Recommend product

First time using it and so far I am satisfied with the results. My 1yr 2month husky was filled with fleas and fleas eggs and with her coat was hard to see them. I gave one tablet to my husky and one to my senior pitbull and this stuff started working within 30 minutes no lie. I have added a picture of the fleas I was able to take out while brushing my husky. Adult and small fleas dead. I definitely with buy again & definitely recommend.

Honest Reviews

Jul 29, 2026

Helped Reduce My Puppy’s Itching

I tried PetArmor CapAction on my puppy, who weighs about 2–3 lbs, and overall I’m happy with the results. My puppy had been itching quite a bit, and after giving this, I noticed she wasn’t scratching nearly as much as she was before.I didn’t see any ticks fall off, so I can’t speak to that, but it seemed to help with the flea-related itching we were dealing with. My puppy did not want to take the tablet by itself, so I’m not sure if it has a taste or smell that dogs don’t like. However, placing it inside a small piece of meat worked perfectly and she took it without a problem.It was easy to give, and I like that it starts working quickly. I would recommend this for pet owners looking for an oral flea treatment option, especially if your dog is picky about taking medication.

Jamie A. Arellano

Jul 22, 2026

Fast Results

We noticed fleas fell off after about 25. Works great

Patricia S.

Apr 28, 2026

Works better than capstar.

I gave my Blue heeler one of these capsules in the next day every flea was gone. She stays in a half acre pen with a dog house inside the barn and we put cedar shavings down along with diametric Earth. We also put the diatometric Earth on the dog. You can purchase that from Tractor supply company. They can even eat it. It keeps ticks flies and bugs away and it's great for gardeners and yards.

Mary Rae Fouts

Sep 9, 2025

A Must Have Flea Product For Fleas Between Regular Monthly Flea Medication Doses!

Fleas are bad all year round here in the San Francisco Bay Area. We have always used a monthly dose of flea preventative on all of our dogs. In spite of that, we occasionally see live fleas between doses.I keep PetArmor CAPACTION oral flea treatment tablets on hand to administer in that situation. Tablets are easy to wrap in some creamy peanut butter and give to the dog. The flea treatment starts killing fleas within 30 minutes, and continues for about 24 yours. It is easy to see the treatment is working, as my dogs are always quickly more comfortable.Note: Flea eggs on your dog are not killed by this treatment, only live fleas. I would not recommend this as your only flea preventative for your dog, but rather an extra treatment when needed.None of my dogs have experienced side effects. I highly recommend this product.

Andrea

Sep 1, 2025

Dogs love it! Starts working in 30 minutes

I use this product often because I have 6 dogs. It works great to get rid of adult fleas. Starts working within 30 minutes and lasts up to 24 hours. Perfect if a dog has alot of fleas. After one pill I wait a day and apply monthly products. Good price, quick delivery and comes with qty 6, so 1 for each of my dogs.

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