Best Monthly Flea Treatments

1. Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment and Flea and Tick Prevention, 6 Months, 5-14 Pound Dogs 6-count(Pack of 1)

Hartz UltraGuard Dual Action Flea & Tick Topical Dog Treatment kills fleas, ticks, and flea eggs on contact. It provides full-body protection for your dog, using natural oils to spread across the skin.

This 6-month supply includes 6 single-dose tubes, one for each month. Apply it between your dog’s shoulder blades for non-stop protection.

2. PetArmor Plus Flea and Tick Prevention for Dogs, Small Dog Flea and Tick Treatment, 3 Doses, Waterproof Topical, Fast Acting (5-22 lbs)

PetArmor Plus is a waterproof flea treatment for small dogs. It kills fleas, ticks, flea eggs, and lice. One dose works for up to 30 days.

This dog flea treatment uses a vet-quality formula with fipronil and (S)-methoprene. It starts killing fleas in 24 hours. It breaks the flea life cycle to stop reinfestation.

The package includes 3 easy-to-use topical doses. They provide nose-to-tail protection for three months.

3. FRONTLINE Plus Flea and Tick Treatment for Large Dogs Up to 45 to 88 lbs. 3 Treatments

FRONTLINE Plus is a fast-acting, waterproof treatment that kills fleas, flea eggs, ticks, and lice on large dogs. It works for 30 days to protect dogs weighing 45–88 lbs.
This topical solution breaks the flea life cycle with two key ingredients: fipronil and (S)-methoprene. It kills adult fleas and stops eggs and larvae from hatching to prevent new infestations.

Use it monthly on all dogs and cats in your home. It’s safe for puppies over 8 weeks old and 5 lbs. or more. Subscribe & save to always have it on hand.

4. Advantage II Large Cat Vet-Recommended Flea Treatment & Prevention | Cats Over 9 lbs. | 2-Month Supply

Advantage II Large Cat is a vet-recommended flea treatment for cats over 9 lbs. It’s a monthly topical solution that kills fleas, flea eggs, and larvae through contact. No pills, no prescription—just easy, fast protection.

The formula works within 12 hours and lasts 30 days. It’s fragrance-free and waterproof after 24 hours.

5. PetArmor Plus Flea and Tick Prevention for Dogs, Large Dog Flea and Tick Treatment, 6 Doses, Waterproof Topical, Fast Acting (45-88 lbs)

PetArmor Plus is a waterproof flea and tick treatment for large dogs. It kills fleas, eggs, larvae, ticks, and chewing lice for up to 30 days. This fast-acting solution starts working within 24 hours.

The formula uses vet-quality ingredients like fipronil and (S)-methoprene. These target fleas at every life stage to break the flea life cycle.

Each easy-to-use topical dose lasts a full month. A 6-dose package gives six months of nose-to-tail protection. Just apply once a month for worry-free flea and tick control.

6. K9 Advantix II Medium Dog Vet-Recommended Flea, Tick & Mosquito Treatment & Prevention | Dogs 11-20 lbs. | 2-Mo Supply

K9 Advantix II is a vet-recommended solution for medium dogs weighing 11-20 lbs. It protects your pet from fleas, ticks, mosquitoes, biting flies, and lice. This 2-month supply keeps your dog safe and healthy.

The easy-to-apply treatment kills fleas within 12 hours. It also repels pests on contact, so they don’t bite your dog. The fragrance-free formula is waterproof after 24 hours.

No prescription needed. Simple to use. Keeps your dog pest-free.

7. Hartz UltraGuard Topical Flea & Tick Prevention for Cats and Kittens – 3 Monthly Treatments

Hartz UltraGuard is a topical drop formula that kills fleas and deer ticks. It comes in 3 monthly treatments for easy use. Each dose is in a single-dose tube for quick application.

This product repels mosquitoes for up to 18 days. It works on cats and kittens 12 weeks and older. Make sure your pet weighs 5 pounds or more before use.

The formula is easy to apply and starts working fast. It gives three months of protection with one purchase. Trusted by many, it keeps pets safe and comfortable.

8. Advantage II Large Cat Vet-Recommended Flea Treatment & Prevention | Cats Over 9 lbs. | 4-Month Supply

Advantage II Large Cat is a vet-recommended flea treatment for big cats over 9 lbs. It’s easy to apply once a month, no pills or prescriptions needed.

Kills fleas, eggs, and larvae on contact. Works in 12 hours. Lasts 30 days. Fragrance-free and waterproof after 24 hours.

Safe for cats 8 weeks old and up. Just one drop gives full flea protection all month.

9. FRONTLINE Plus Flea and Tick Treatment for Medium Dogs Up to 23 to 44 lbs. 3 Treatments

FRONTLINE Plus is a fast-acting, waterproof flea and tick treatment for dogs. It kills fleas, ticks, and lice for up to 30 days with one monthly dose.

It uses fipronil and (S)-methoprene to break the flea life cycle. This stops eggs, larvae, and adult fleas. It’s safe for puppies 8 weeks old and 5 pounds or more.

Protection for cats is also available from FRONTLINE. Subscribe & save to keep your pets safe all year.

10. Amazon Basics Topical Flea Treatment for Large Cats (Over 9 pounds), 6 Count, Packaging May Vary

Amazon Basics Flea Treatment is a 6-dose pack for large cats over 9 pounds. It kills fleas fast, giving relief in just 12 hours. Each dose protects for up to 4 weeks.

The dual-ingredient formula stops fleas from coming back. It’s easy to apply and has a long shelf life. Packaging may vary, but the quality stays the same.