Capstar - Fast Acting Oral Flea Treatment

TL;DR: Capstar is a fast-acting oral flea tablet that starts killing adult fleas within 30 minutes, giving dogs rapid relief during an active infestation. It's a short-term knock-down treatment — not a long-term preventive — and comes in two variants sized for small or large pets.

When fleas show up, speed matters. Capstar delivers an oral dose that works within half an hour, making it a practical first step before transitioning to an ongoing flea and tick routine for dogs in Canada.

Key features

• Starts killing adult fleas within 30 minutes of ingestion.
• Can eliminate the majority of adult fleas within 4 hours.
• Tablet can be given directly or mixed with food.
• Safe to repeat once daily if new fleas appear.
• Designed as a rapid knock-down — pair with a longer-acting product for ongoing flea and tick control.
• Dose must match the pet's weight category.

Capstar is offered in two variants: Small Dogs & Cats and Large Dogs. Choose the variant that matches your pet's body weight at checkout.

Specifications

Attribute	Value
Brand	Capstar
Format	Oral tablet
Onset of action	Within 30 minutes
Suitable for	Dogs and puppies 4 weeks and older
Weight range (Large Dogs variant)	25.1 lb (≈11.4 kg) and above
Life stage	Adult
Variants	Small Dogs & Cats, Large Dogs
Dosing frequency	Once daily as needed

Who is it for?

Capstar is for dog owners in the GTA dealing with a visible flea infestation who want fast relief before starting a longer-term routine. The Large Dogs variant is intended for pets over 25.1 lb, while the Small Dogs & Cats variant covers lighter pets from 4 weeks of age.

It's a useful addition to any household topicals kit in Toronto where multiple pets may share bedding or outdoor space.

How do you give Capstar to a dog?

Give one tablet matched to your pet's weight category, either directly by mouth or mixed into a small portion of food. If new fleas appear after treatment, you can repeat the dose once per 24 hours.

Because Capstar is a knock-down treatment rather than a preventive, follow up with a longer-acting product to help reduce re-infestation.

What should you use alongside Capstar?

If you're building out an ongoing flea and tick prevention routine, consider Advantix II - Flea & Tick Medicine or Advantage II - Flea & Tick Medicine for dogs, and Advantage II - Flea & Tick Medicine for smaller cats and kittens in the household.

As one of the go-to topicals in Toronto for rapid flea response, Capstar pairs well with a monthly topical so you stay covered beyond the initial knock-down.

Available for same-day pickup at our North York, Toronto storefront, or ships Canada-wide.