Interceptor for dogs and cats
Prevents heartworm and treats hookworms and roundworms. Some combinations also control fleas. [1]
Key facts
| Generic name | Milbemycin oxime |
|---|---|
| Common brand names | Interceptor, Sentinel, Trifexis |
| Used in | Dogs & Cats |
| Type | Flea, tick & heartworm |
| Prescription? | Prescription |
| Typical US price | $6–$18 a dose [3] |
What it's used for
Prevents heartworm and treats hookworms and roundworms. Some combinations also control fleas. [1]
How it works
It kills heartworm larvae and some intestinal worms by acting on their nerves. [1]
Side effects and cautions
Common side effects: Well tolerated at regular doses. Higher doses can cause weakness, wobbliness and drooling. [1]
Use with care: Dogs need a negative heartworm test before starting. [1] [2]
Call your vet right away if your pet has trouble breathing, facial swelling, hives, collapse, or any side effect that is severe or getting worse.
What it costs
- Monthly heartworm preventive, as listed on owner bills: $6–$18 a dose [3] see the cost guide
Prices come from public owner-bill reports and vary by clinic, pharmacy, pet size and dose.
Interceptor FAQ
What is Interceptor used for in dogs and cats?
Prevents heartworm and treats hookworms and roundworms. Some combinations also control fleas.
What are the side effects of Interceptor?
Well tolerated at regular doses. Higher doses can cause weakness, wobbliness and drooling.
Does Interceptor need a prescription?
Yes. It needs a prescription from a veterinarian.
How much Interceptor should I give my pet?
Only your veterinarian can tell you. The right dose depends on your pet's weight, health and other medicines, so we don't list doses. Never give a pet a medicine prescribed for a person or another animal without asking your vet.
Related medications
Related cost guides
This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.