Free standard delivery over £50

Unbranded, secure packaging guaranteed

5% off your first order

When you sign up

Registered Veterinary Retailer

Genuine pet medicine

Frontline Tri-Act Spot-On Flea, Tick & Lice Treatment for Dogs
From Price range: £25.06 through £26.67
FRONTLINE-TRI-ACT-3-PARENT-Range-Shot-DOGS-5-40kg
Front-Line-TRI-ACT-3-CHILDREN-Shot-S-DOG
Front-Line-TRI-ACT-3-CHILDREN-Shot-M-DOG
Frontline-Tri-Act-Spot-On-Flea-Tick-Lice-Treatment-for-Dogs-UK-L-dog

Frontline Tri-Act Spot-On Flea, Tick & Lice Treatment for Dogs

From Price range: £25.06 through £26.67

FRONTLINE TRI-ACT® is a spot-on solution with a triple-action formula that kills newly arriving fleas and ticks within 6 hours. It also repels flying insects for up to 5 weeks and is available in convenient 3-dose packs. We offer a full range of sizes for dogs weighing 5 kg and above, with a guide for dogs over 40 kg.

  • Triple-Action Protection
  • Fast Acting Formula
  • Long-Lasting Repellent

 

Order Monday to Friday before 14:00pm to guarantee next
day delivery.

Ordering Prescription-Only Products

This item requires a current prescription from your vet before we can dispatch it. The good news? Sorting it out is simple and only takes a moment.

  1. Select or register your pet
  2. Attach a clear image or PDF of the prescription
  3. Complete your order at checkout

As soon as your prescription reaches us, our team will verify the details and get your pet’s treatment posted out to you.

Order Monday to Friday before 14:00pm to guarantee next
day delivery.

Veterinary Medicines Directorate (VMD) registered veterinary retailer logo

Accredited Retailer

GPhC registered pharmacy 1039428

A registered RCVS Vet Practice (7615389)

Product Features

FRONTLINE TRI-ACT® is a spot-on solution with a triple-action formula that kills newly arriving fleas and ticks within 6 hours. It also repels flying insects for up to 5 weeks and is available in convenient 3-dose packs. We offer a full range of sizes for dogs weighing 5 kg and above, with a guide for dogs over 40 kg.

  • Triple-Action Protection
  • Fast Acting Formula
  • Long-Lasting Repellent

 

Product Details

FRONTLINE TRI-ACT® Spot-On Solution for Dogs – 3-Dose Pack

FRONTLINE TRI-ACT® is a spot-on treatment for dogs that protects them from fleas, ticks, mosquitoes, biting flies, and sandflies. It contains fipronil and permethrin, working quickly to keep your dog safe and comfortable.

It kills newly arriving fleas and ticks within 6 hours from 2 days after treatment. It also repels ticks for 4 weeks and flying insects for up to 5 weeks, helping prevent bites. When used every 4 weeks, it stops flea infestations in the home by killing fleas before they can lay eggs.

FRONTLINE TRI-ACT® gives your dog fast, long-lasting protection, so they can enjoy playtime and outdoor adventures without the worry of fleas, ticks, or biting insects.

It’s available in 3-dose packs.
  • For dogs weighing 5-10 kg
  • For dogs weighing 10-20 kg
  • For dogs weighing 20-40 kg
For dogs above 40 kg bodyweight, use the appropriate combination of two pipette sizes that most closely matches the bodyweight.
  • Frontline Tri-Act (NFA-VPS): No prescription needed, supplied by a vet, pharmacist, or SQP with safe-use advice in the UK.

Treat carpets and furnishings too with Frontline Homegard Flea Spray, and see our guide on how to check your dog for fleas.

Instructions

How is it administered?

  1. Part the dog’s fur between the base of the skull and the shoulder blades until the skin is visible.
  2. Place the tip of the pipette on the skin and squeeze to empty the contents onto the skin: half of the contents halfway
    down the neck and the other half in front of the shoulder blades.
  3. Do not bathe the dog or let them swim for 2 days after application and no more than once a week thereafter.
  4. Any cats in the household should be kept away from treated dogs until the application site is dry.
  5. Ensure cats do not groom the site of application.
  6. For optimal protection, use FRONTLINE TRI-ACT® every 4 weeks to help protect your dog against fleas, ticks and flying insects.

Please remember it’s always best to treat the dog according to their lifestyle. For example, dogs who go to
areas where wildlife such as hedgehogs, foxes or other animals can roam will be at higher risk of picking up fleas and ticks than those who don’t.

Sizes

There are 3 different pack sizes available for dogs:

  • Dogs 5kg-10kg (3 Pipettes)
  • Dogs 10kg-20kg (3 Pipettes)
  • Dogs 20kg-40kg (3 Pipettes)

For dogs above 40 kg bodyweight, use the appropriate combination of two pipette sizes that most closely matches the bodyweight.

Key Benefits

  • Triple-Action Protection: Kills and repels a broad spectrum of parasites, including fleas, ticks, mosquitoes, and biting flies.
  • Rapid-Effect Formula: Starts killing fleas and ticks within 6 hours of application.
  • Long-Lasting Repellent: Repels flying insects for up to 5 weeks and ticks for 4 weeks.

Ingredients

The active ingredients in FRONTLINE TRI-ACT are fipronil and permethrin.

How ordering works

No prescription needed for this item. A vet, pharmacist or SQP checks every order before it’s supplied.

Legal category: NFA-VPS

  1. Choose size and pack

    Pick the weight band or pack size you need, then add to basket.

  2. Check out in 3 steps

    Delivery method, billing, payment. Free standard delivery over £50.

  3. Packed and posted

    Royal Mail Standard (2–3 working days) or 24 First Class (1 working day). Unbranded, secure packaging.

Delivery and returnsOrdering FAQsAsk our team

Frequently asked questions

What is Frontline Tri-Act Spot-On used for?
Frontline Tri-Act is used to treat and prevent fleas, ticks, and biting lice in dogs. It also helps repel flying insects such as mosquitoes and sandflies.
What parasites does Frontline Tri-Act treat?
It kills fleas, ticks, and lice. It also repels mosquitoes, sandflies, and stable flies, helping reduce the risk of insect-borne disease transmission.
How does Frontline Tri-Act work?
It contains fipronil and permethrin. Fipronil kills fleas and ticks after contact, while permethrin both kills and repels parasites.
How quickly does it work?
Fleas are usually killed within 24 hours. Ticks are typically killed within 48 hours. Repellent action begins shortly after application.
How often should it be applied?
Apply once monthly for continuous protection.
How is it applied?
It is a spot-on treatment applied directly to the skin, usually between the shoulder blades and along the back as directed on the label.
Can dogs be bathed after application?
Avoid bathing or swimming for at least 48 hours after application. Frequent washing may reduce effectiveness.
Is Frontline Tri-Act safe for all dogs?
It is suitable for dogs over 8 weeks of age and above the minimum weight stated on the packaging. It must not be used in cats.

Latest Blogs

Maximum file size: 256 MB

Add New Pet

Add Photo

To ensure we send the right the right type of medication please tell us about your pet below.

Date of Birth (please approximate if unsure)*

Allergies?