Interceptor Heartworm Medicine for Dogs & Cats at Drs. Foster & Smith
Email Sign-Up


Interceptor ® Flavor Tabs (Brand) by Novartis

Interceptor <sup>®</sup> Flavor Tabs (Brand)<br/><em>by Novartis</em>
| view larger image |
Download the Patient Information Sheet Download our Patient Information Sheet (PDF)
2.3 mg, 2-10 lb dogs
6 ct
$4.99 each
How many 6 cts?
$6.49 each
How many Tablets?
Total Qty: 1 x 1 = 1
Price Per Tablet: $6.49
Subtotal: $6.49
Add to Cart
All items In-Stock and ready for delivery unless otherwise noted
Please note, product has expiration date of August 2018.
5.75 mg, 11-25 lb dogs or 1.5-6 lb cats
6 ct
$5.33 each
How many 6 cts?
$6.99 each
How many Tablets?
Total Qty: 1 x 1 = 1
Price Per Tablet: $6.99
Subtotal: $6.99
Add to Cart
All items In-Stock and ready for delivery unless otherwise noted
Please note, product has expiration date of April 2018.
11.5 mg, 26-50 lb dogs or 6.1-12 lb cats
6 ct
$6.33 each
How many 6 cts?
$7.49 each
How many Tablets?
Total Qty: 1 x 1 = 1
Price Per Tablet: $7.49
Subtotal: $7.49
Add to Cart
All items In-Stock and ready for delivery unless otherwise noted
Please note, product has expiration date of April 2018.
23 mg, 51-100 lb dogs or 12.1-25 lb cats
6 ct
$7.66 each
How many 6 cts?
$8.99 each
How many Tablets?
Total Qty: 1 x 1 = 1
Price Per Tablet: $8.99
Subtotal: $8.99
Add to Cart
All items In-Stock and ready for delivery unless otherwise noted

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 flavor tabs are easy to administer

How does Interceptor work?
Interceptor is used in the prevention of heartworm and the prevention, control and treatment of 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. Drs. Foster and Smith recommends (and our guarantee requires) 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?

Please click on "More Information" for possible drug and food interactions with this medication.

More Info

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-77°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.

Where is more information available?
Ask your veterinarian, consult with one of our pharmacists at 1-800-447-3021, or see the Patient Information Sheet on this medication. For technical assistance or to report suspected adverse reactions, call the manufacturer, Novartis, at 1-800-332-2761.

Prevent heartworm infection in your dog with this heartworm and intestinal wormer
Frequently Asked Questions about Heartworm
Heartworm disease is devastating. The good news is that this disease is preventable.
Although heartworm is treatable, it may result in serious complications. No matter what it costs in dollars, the cost is even greater to the long-term health of your pet.
Drs. Foster and Smith Licensed Pharmacy

Your pet's health is our #1 priority, which is why we make ordering prescription medications from Drs. Foster and Smith as easy as 1 - 2 - 3!

At the completion of your order, you will be prompted to supply us with your veterinarian's information including how we will receive your pet's prescription from the following options:

Let us do the legwork! We will contact your veterinarian for prescription authorization.
You already have an existing prescription on file with Drs. Foster and Smith.
Your pet's prescription is in the mail.
Your veterinarian is calling or faxing the prescription to our pharmacy.
PetsPharmacy Hours
Mon. - Fri. 9:00 a.m. - 6:00 p.m. CST
Sat. 9:00 a.m. - 1 p.m. CST
Contact Us
Pharmacy Phone:
1-800-447-3021 (Toll Free)
Pharmacy Fax:
1-800-447-2404 (Toll Free)
Pharmacy Address:
P.O. Box 100
Rhinelander, WI 54501
Our pharmacy staff prides itself on providing you with the service and ease of ordering that you have come to trust exclusively from Drs. Foster and Smith.

My Account