Bravecto for Cats & Dogs: How Long It Lasts & Safety

You pull a tick off your dog after a walk, or the cat starts scratching, and you can't remember the last time you treated her. Bravecto is a common treatment for both of these issues. But if you haven’t used it on a pet before, it’s important to know how long Bravecto lasts, and if it’s safe for dogs and cats. 

Both answers shift depending on which pet you've got and which format you're using. So here's everything you need to know about what fluralaner actually does, how long each chew and spot-on keeps working, where Bravecto's safety stands, and the dosing details to get right before the next dose.

Quick Answers

• Bravecto's active ingredient is fluralaner, which kills fleas and ticks after they bite your pet rather than repelling them.
• Dogs: the chew protects against fleas and paralysis ticks for 3 months (and brown dog and bush ticks for 2 months); the spot-on lasts 6 months for fleas and paralysis ticks (12 weeks for brown dog ticks).
• Cats: the spot-on protects against fleas and paralysis ticks for up to 3 months; Bravecto Plus adds heartworm and worm cover and is generally reapplied every 2 months in paralysis tick areas.
• Most dogs and cats tolerate Bravecto well. The main safety flag is a class-wide caution about uncommon neurological reactions in some animals.
• No product stops tick paralysis with total certainty, so daily tick searches stay essential if you live in or visit a tick zone.

What Is Bravecto and How Does It Work?

Bravecto is a flea and tick treatment made by MSD Animal Health, built around the active ingredient fluralaner. Fluralaner sits in a group of medicines called the isoxazolines, which work by blocking specific chloride channels in a parasite's nervous system. That mechanism is far more active in insect and tick nerve cells than in mammal ones, which is why it can kill parasites while remaining well tolerated by most pets.

Whether you use a chew or a spot-on, fluralaner is absorbed and spreads through the tissue fluid just under your pet's skin. A flea or tick has to bite and feed to take in a lethal dose. Bravecto doesn't repel parasites, so a tick can still attach before it dies. It starts killing fleas within 8 hours of a dose.

If you're weighing up your options across the whole category, it can help to look at the full range of tick and worm treatment for dogs before settling on one product.

How Long Does Bravecto Last?

A chew, a spot-on and the vet-administered injection all last different lengths of time. Here's how the Australian products break down.

For dogs, the Bravecto chew covers fleas and paralysis ticks for 3 months, which works out to four doses a year, while brown dog ticks and bush ticks need a top-up every 2 months. The dog spot-on stretches paralysis tick and flea cover for a full 6 months, so many owners manage it with just two applications a year, with a 12-week interval if brown dog ticks are the concern.

For cats, Bravecto Spot-On for Cats provides up to 3 months of flea and paralysis tick protection and treats ear mites. If your cat needs broader cover, Bravecto Plus for Cats combines fluralaner with moxidectin to add heartworm prevention, intestinal worm treatment, and 12 weeks of lungworm protection. In paralysis tick areas, it's typically reapplied every 2 months to keep tick cover continuous.

You'll find both the chew and spot-on options grouped together in the Bravecto for dogs and Bravecto for cats ranges.

Is Bravecto Safe for Dogs?

For most dogs, yes. Regulators, including the FDA, note that isoxazoline products remain safe and effective for the majority of animals treated. The most commonly reported side effects are mild and short-lived, such as vomiting, reduced appetite, lethargy, diarrhoea or itching. Bravecto has also been assessed for use in breeding, pregnant and lactating dogs.

There is one caution worth understanding properly. Since these medicines came to market, regulators have flagged that isoxazolines have been linked to neurological reactions in some dogs and cats, including muscle tremors, loss of coordination (ataxia) and seizures. These reactions are uncommon, and most pets never experience them, but they can occur even in animals with no prior history of seizures. If your dog has a history of seizures or a known neurological condition, that's a conversation to have with your vet before starting or continuing any product in this class.

The practical takeaway isn't to avoid treatment, since fleas and paralysis ticks carry real risks of their own. It's about knowing what to watch for and treating the choice as an individual decision for your dog rather than a one-size-fits-all default.

Is Bravecto Safe for Cats?

The safety picture for cats is similar. Most cats tolerate the spot-on well, and reported side effects are usually mild. With the topical, the coat at the application site (the base of the skull) may look damp, greasy, or slightly clumped for a short time after application. That's expected and settles on its own.

Two rules matter for cats specifically. First, only ever use a product formulated for cats on a cat; treatments made for dogs can be dangerous if applied to felines. Second, the same class-wide caution about neurological signs applies, so if your cat shows tremors, wobbliness or any unusual behaviour after a dose, stop and speak with your vet.

Getting the Bravecto Dose Right

Bravecto is dosed based on body weight, so an accurate current weight is the foundation for getting it right. Both the dog chew and dog spot-on can be used from 8 weeks of age in puppies weighing at least 2 kg, while the cat products suit kittens from 9 weeks of age, weighing at least 1.2 kg.

A few dosing habits keep things simple and safe:

• Weigh your pet before choosing a pack rather than estimating, especially with growing puppies and kittens who can quickly move up a weight band.
• Don't split, combine or guess doses to make a pack "fit" a weight in between bands. Ask your vet which option is correct.
• After a dog spot-on, keep your dog dry for 72 hours so the solution absorbs properly.
• Set a reminder for the reapplication date that matches your product and your parasite risk, since gaps in cover are where protection quietly fails.

Ordering the right pack shouldn't mean a trip across town or a premium clinic price. As an Australian online vet pharmacy, The Animal Pharmacy stocks the full Bravecto range for dogs and cats at prices below those of many traditional clinics, with home delivery so the next dose arrives before you've forgotten about it.

If you're not sure which format fits your pet's weight, age, and parasite risk, browse the cat flea and tick treatment options or reach out for help choosing.

When to Speak to Your Vet

Bravecto does a lot in a single dose, but a few situations are worth a professional opinion. Book or call your vet if your pet has a history of seizures or neurological problems, if they're on other medications, if they're very young, elderly or unwell, or if you notice tremors, unsteadiness or seizures after a dose (in which case, stop the product and seek advice promptly).

It's also worth remembering that no flea and tick product removes the risk of tick paralysis entirely. In paralysis tick areas, Bravecto works best alongside a daily hands-on search of your pet's coat, so any attached tick can be found and removed early. Your vet can show you where ticks like to hide and how to remove one safely.

Keeping Your Pet Protected

Bravecto gives dogs and cats long-lasting flea and tick protection from a single dose, with formulations ranging from a 3-month chew to a 6-month spot-on to a 12-month vet injection, and most pets tolerate it well. Match the format to your pet's weight and parasite risk, stay on top of reapplication dates, and keep up daily tick checks in tick season, and you've got an effective, low-effort routine.

This article is general information only and isn't a substitute for personalised veterinary advice. Always read the product label and speak with your vet about the right parasite prevention for your individual pet.