Amazon Basics Flea, Tick & Mosquito Topical for Medium Dogs, 11–20 lb, 4 Count

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Product guide

Amazon Basics Flea, Tick & Mosquito Topical for Medium Dogs, 11–20 lb, 4 Count

Mosquito Medium Count: Amazon Basics 11321 is a four-dose topical treatment for dogs weighing 11–20 pounds. The listing claims each application provides up to 30 days of protection and starts eliminating fleas and ticks within 24 hours. Customer feedback is mixed on effectiveness and duration, so those claims should not be treated as guaranteed outcomes.

At a glance

Topical drops intended for medium dogs weighing 11–20 pounds.
Four-dose pack. The listing claims up to 30 days of protection per application.
The listing says flea and tick elimination starts within 24 hours.
Listing describes activity against flea eggs, flea larvae, mosquitoes, biting flies and chewing lice.

Price

$20.98Save 22%

Reference price: ~~$27.06~~

Price checked: Nov 14, 2026

View offer

Often bought together

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Pros and cons

Pros

Topical drop format provides an alternative to oral flea treatments.
Four doses are included, with a stated weight range and age range to help assess fit.
The listed unscented formula may suit buyers who prefer a product without added scent.

Cons

Customer feedback reports inconsistent flea control, with some saying fleas remained or treatment did not work.
Some customers report dogs itching or scratching after application.
Customers also report that protection does not last as long as they expected.

Technical specifications

13 specifications

Identity
Brand	Amazon Basics
Model	11321
Target species	Dog
Weight range	11-20 pounds

Treatment details
Form	Drops
Scent	Unscented
Active ingredients	FiImidacloprid, Permethrin, Pyriproxyfen
Age range	7 Weeks or Older
Volume	0.14 fluid ounces
Allergen information	Allergen-Free
Count	4 Count

Dimensions and installation
Dimensions listed	1.4 x 4.27 x 4.75 inches; 0.86 ounces
Weight listed	22.68 g

What to know before buying

The listing claims up to 30 days of protection per application, but customer feedback includes reports of shorter-lasting results. Use only for a dog within the stated weight and age range, and follow the product label. Keep out of reach of children.

Who is it for?

A good fit for

Dog owners seeking topical drops for a dog weighing 11–20 pounds.
Buyers looking for a four-dose treatment whose listing claims coverage against fleas, ticks and mosquitoes.

Less suited to

Dogs outside the stated 11–20-pound range or younger than 7 weeks.
Buyers who need assured effectiveness or duration, given customer reports of inconsistent results and protection that did not last.

Amazon Basics Flea, Tick & Mosquito Topical for Medium Dogs, 11–20 lb, 4 Count · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.1 / 5 · 1,850 ratings

5 stars63%63%
4 stars13%13%
3 stars8%8%
2 stars4%4%
1 star12%12%

Customer feedback highlights ease of application and a slight smell, but reports on flea control and value vary. Some say it worked, while others say fleas remained or saw no effect. Some customers also report itching or scratching, and others say the treatment did not last. This matters because the listing claims flea and tick elimination starts within 24 hours and up to 30 days of protection, but customer reports do not consistently match those claims. The overall rating leans positive, though the distribution also includes a notable one-star share. Ratings alone do not explain the reasons behind individual experiences.

Positive themes

Customers are reported to find the drops easy to apply.
Some customers appreciate the slight smell.

Negative themes

Some customers report that fleas remained or the treatment did not work.
Some report that its effect did not last.
Some customers report dogs itching or scratching after application.

Mixed feedback

Customers disagree about value for money, with some finding it affordable and others considering it a poor purchase.

Frequently asked questions

Which dogs is this treatment intended for?

The listing specifies medium dogs weighing 11–20 pounds and an age range of 7 weeks or older.

How many doses are included?

The listing identifies a four-dose pack.

How long does one application supposedly last?

The listing claims up to 30 days of protection per application. Customer feedback includes reports that the effect did not last, so the duration is not assured.

What should I know about reported results?

Customer feedback is mixed on flea reduction and effectiveness. Some customers also report itching or scratching after application. Follow the package directions and consult a veterinarian if you have concerns about use or a reaction.