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Interceptor Flavored Tablet for Dogs, 26-50 lbs, & Cats, 6.1-12 lbs, (Yellow Box)


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  • Item Number: 146148
  • Generic Name: Milbemycin Oxime
  • Common Brand Name(s): Interceptor
  • For Use: Dogs & Cats
  • Administration Form: Oral
  • Repels or Prevents: Heartworms
  • Kills or Treats: Roundworms, Hookworms, Whipworms
  • Breed Size: Medium Breeds
  • Product Form: Chewable Tablet
  • Strength: 11.5 mg Milbemycin Oxime
  • Health Condition: Heartworms, Hookworms, Roundworms, Whipworms
  • Drug Type: Parasiticide


Active Ingredients: Milbemycin Oxime

Main Ingredients: Contains Milbemycin Oxime as the active ingredient in strengths of 2.3 mg, 5.75 mg, 11.5 mg, or 23 mg (based on your pet’s species and body weight).

Tip: Interceptor has been trusted and recommended by veterinarians for more than 2 decades. The tablets are accepted by 95% of dogs. More than 1/2 a billion doses have been prescribed!



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Interceptor for Dogs and Cats is a flavored tablet that removes and controls adult roundworm and whipworm infections in cats, dogs, and puppies (2 pounds or greater, 4 weeks old and up), controls adult hookworms and prevents heartworm disease associated with Dirofilaria immitis.

Key Benefits:

  • Interceptor works to kill the tissue stage of heartworm larvae
  • Toxocara canis (roundworms), Trichuris vulpis (whipworms), and adult Ancylostoma caninum (hookworms) upon oral administration
  • Milbemycin Oxime has anthelmintic properties, which are believed to interfere with the neurotransmission of invertebrates.

    Formulated For: Intended for cats and dogs.

    How is Medication Given? Recommended Monthly Dose:

  • Dogs Weighing 2 to 10 Pounds: Brown Packaging (2.3 mg Milbemycin Oxime Per Tablet)
  • Dogs Weighing 11 to 25 Pounds or Cats Weighing 1.5 to 6 Pounds: Green Packaging (5.75 mg Milbemycin Oxime Per Tablet)
  • Dogs Weighing 26 to 50 Pounds or Cats Weighing 6.1 to 12 Pounds: Yellow Packaging (11.5 mg Milbemycin Oxime Per Tablet)
  • Dogs Weighing 51 to 100 Pounds or Cats Weighing 12.1 to 25 Pounds: White Packaging (23 mg Milbemycin Oxime Per Tablet)
  • Dogs Weighing More Than 100 Pounds: Consult Veterinarian for Proper Combination of Tablets. Minimum recommended dosage is 0.5 mg of Milbemycin Oxime per kg of body weight.

    What Results Can I Expect? Interceptor is an appealing, easy-to-administer, once-monthly medication that protects dogs and cats against the four most common types of worms – heartworms, hookworms, roundworms, and whipworms.

    What Form Does Medication Come In? Tablet

    Dose and Administration: Sold as a 6-month or 12-month supply in four color-coded, weight-based strengths.

    Possible Side Effects: Potential adverse reactions include: Vomiting; Diarrhea; Depression; Lethargy; Incoordination; Decreased appetite; Convulsions; Weakness; Salivation

    Precautions Heartworm testing should take place before starting on this medication. If the dog is found to have heartworm disease, treatment is recommended before taking this medication. This product is safe for the majority of dogs. Keep away from children and animals.

    Storage Recommendations: Store at room temperature.

    In Case of Overdose: Contact the nearest emergency pet clinic immediately.


Your pet must have a current heartworm test result on file with your veterinarian in order to be prescribed heartworm medication. Heartworm testing is performed annually by your veterinarian to help protect your furry friend.

What is Interceptor?
You can protect your pet from heartworm and intestinal worms with one medication. This monthly oral pet medication can be used in dogs, puppies, cats, and kittens to kill the immature form of the heartworm (Dirofilaria immitis). Interceptor also controls adult hookworms (Ancylostoma caninum and Ancylostoma tubaeforme), and removes and controls adult roundworms (ascarids – Toxocara canis and Toxascaris leonina in dogs and Toxocara cati in cats), and whipworms (Trichuris vulpis) in dogs.

Who is it for?
For dogs and puppies over 4 weeks of age weighing more than 2 pounds, and cats and kittens over 6 weeks of age weighing more than 1.5 lbs. Safe to use in pregnant and nursing dogs.

What are the benefits?

  • Easily protect your dog, puppy, cat, or kitten from heartworm and intestinal worms
  • Treats and controls hookworm, roundworm, and whipworm
  • Tasty beef-flavored tablets are easy to administer

How does Interceptor work?

Interceptor is used in the prevention, control, and treatment of heartworm and various other worm infections. Interceptor contains milbemycin oxime, which is thought to interfere with the parasite’s nerve transmission, causing death of immature heartworms (larvae) and adult intestinal worms.

Is there a generic equivalent available?

How is it given?
Interceptor must be administered monthly, preferably on the same date each month. It is recommended (and most manufacturer guarantees require) that Interceptor be given year round, although some veterinarians may recommend giving it only during the mosquito season. If given seasonally, the first dose must be given within 30 days of the pet’s first exposure to mosquitoes. The last dose must be given within 30 days after the pet’s last exposure to mosquitoes.

Most dogs and cats like the taste of Interceptor and will accept the tablet as a treat. Interceptor may be crumbled and mixed with some food. Care should be taken that the dog consumes the complete dose, and treated animals should be observed for a few minutes after administration to ensure that part of the dose is not lost or rejected. If not entirely consumed, give another full recommended dose as soon as possible.

What results can I expect?
Interceptor will kill the immature heartworms the pet was exposed to in the preceding month. It will treat an intestinal infection with adult hookworms and roundworms.

What form(s) does it come in?

Brand Name
Interceptor Flavor Tabs


Common Drug Name
Milbemycin oxime

What should I discuss with my veterinarian while considering Interceptor?
Talk to your veterinarian about the heartworm testing that is recommended before starting your pet on a heartworm prevention program.

Some intestinal parasites, such as hookworms and roundworms can be spread to people. Talk to your veterinarian about other measures you can take to prevent your pet from being infected with intestinal worms, and protecting yourself.

Notify your veterinarian of any other medications or supplements your pet is taking, and also if your pet has had any reactions to previous medications.

What should I do if I miss a dose?
If a dose is missed and over 30 days have gone by since the last dose, give Interceptor immediately and resume the monthly dosing schedule. Tell your veterinarian that a dose was missed.

What is the most important information I should know?
If the interval between doses is longer than one month, the efficacy of the drug is reduced.

Who should not take it?
Do not use in puppies less than 4 weeks of age or less than 2 pounds, or in kittens less than 6 weeks of age or less than 1.5 pounds.n

The safety of Interceptor in pregnant, nursing, or breeding cats has not been determined.

This medication should only be given to the pet for which it was prescribed.

What side effects may be seen when taking Interceptor?
Side effects of Interceptor are rare, but may include vomiting, depression, diarrhea, drooling, staggering, weakness, and seizures. If you observe any of these side effects, contact your veterinary immediately.

How is it stored?
Interceptor Flavor Tabs should be stored in a dry place at room temperature between 59°F-86°F. The chewable tablet is appealing to pets and children. Store in a secure area to prevent an accidental overdose. Keep out of reach of children and pets.

What should I do if I know of or suspect there has been an overdose?
If you know or suspect your pet has had an overdose, or if you observe vomiting, depression, diarrhea, staggering, weakness, or seizures, contact your veterinarian immediately.

What should I avoid when giving my pet Interceptor?
Although there are no known drug or food interactions with this medication, consult with your veterinarian before using Interceptor with any other medications, including vitamins and supplements, since interactions may occur.

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