Interceptor Tablets for Dogs and Cats, 6-Month Supply
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Interceptor (milbemycin oxime) is a once-a-month tablet that prevents heartworm disease in dogs and cats.
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Protect your pet from heartworm and intestinal worms.
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One monthly tablet keeps both dogs and cats safe from heartworm disease.
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Powerful protection against heartworms and intestinal parasites.
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Just one easy-to-give dose, administered monthly, provides protection against three dangerous (and potentially fatal) infections.
INDICATIONS:
INTERCEPTOR is indicated for use in the prevention of heartworm disease caused by Dirofilaria immitis, the control of adult Ancylostoma caninum (hookworm), and the removal and control of adult Toxocara canis and Toxascaris leonina (roundworms) and Trichuris vulpis (whipworm) infections in dogs and in puppies four weeks of age or greater and two pounds body weight or greater.
INTERCEPTOR for Cats is indicated for use in the prevention of heartworm disease caused by Dirofilaria immitis, and the removal of adult Ancylostoma tubaeforme (hookworm) and Toxocara cati (roundworm) in cats and kittens six weeks of age or greater and 1.5 lbs. body weight or greater.
IMPORTANT SAFETY INFORMATION:
Dogs and cats should be tested for existing heartworm infection prior to use. In a small percentage of treated dogs, digestive and neurologic side effects may occur. Safety in heartworm-positive cats has not been established. Safety in breeding, pregnant and lactating queens and breeding toms has not been established. View
full product label for complete safety information.
Product sourced directly from the manufacturer or their approved distributor. Guaranteed genuine product backed by the manufacturer.
For
Dogs and Cats
Active ingredient(s)
Milbemycin oxime
Product class
Parasiticide, Flavored tablet
Product flavoring
Interceptor Flavor Tabs are “beef” flavored.*
*Contains pork, hydrolyzed soy (does not contain actual beef).
Product strength & size
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Package Color
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Body Weight
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Milbemycin oxime (per tablet)
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Brown
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Dogs 2 to 10 lbs.
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2.3 mg
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Green
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Dogs 11 to 25 lbs.
Cats 1.5 to 6 lbs.
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5.75 mg
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Yellow
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Dogs 26 to 50 lbs.
Cats 6.1 to 12 lbs.
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11.5 mg
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White
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Dogs 51 to 100 lbs.
Cats 12.1 to 25 lbs.
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23 mg
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For dogs over 100 lbs. or cats over 25 lbs., administer the appropriate combination of tablets to cover your pet’s body weight.
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Please ensure the selected product and quantity are appropriate for your pet, as recommended by your veterinarian. For current availability, please refer to the product selection above.
Usage
Interceptor should be given orally as directed by your veterinarian. Please consult your veterinarian before making any changes or discontinuing the prescribed dosing schedule.
If a dose is missed: Give Interceptor immediately to resume monthly dosing and notify your veterinarian. Do not give more medication than prescribed or two doses at once.
If multiple doses have been missed, consult your veterinarian prior to restarting the monthly dosing schedule. If you have questions about your pet’s prescribed dosing schedule (e.g., timing, interval), please contact your veterinarian.
Additional information may be provided within the manufacturer’s full Prescribing Information. Always follow the specific instructions provided by your veterinarian regarding your pet's care.
Storage
Store in a cool, dry place at a controlled room temperature between 59° and 77°F. Keep this and all other medications in a secure location out of the reach of children and animals. Tablets should remain sealed in their original packaging and should only be taken out at the time of dosing.
Exposure to extreme temperatures, light, or moisture can affect the integrity and effectiveness of medications. Always store this medication properly (e.g., away from the bathroom, kitchen sink, or other damp places), as outlined on the product label.
Side effects
Interceptor is generally well tolerated, and side effects are considered uncommon when given at the recommended dosage.
The following adverse reactions have been reported following the use of INTERCEPTOR: Depression/lethargy, vomiting, ataxia, anorexia, diarrhea, convulsions, weakness and hypersalivation.
Contact your veterinarian immediately if your pet experiences a shock-like reaction, excessive drooling, seizures, tremors, extreme weakness, or decreased coordination (e.g., staggering, stumbling, difficulty walking).
The information provided above may not encompass all possible side effects. Please notify your veterinarian if your pet experiences any side effects, including those listed above, or if you notice anything unusual.
Precautions
Before using this product, please review the manufacturer’s full Prescribing Information for any relevant warnings and safety precautions.
For oral use in dogs and cats only. Keep this and all drugs out of the reach of children and animals.
Do not use in puppies less than four weeks of age or less than two pounds of body weight. Dogs with existing heartworm infections should be treated to remove adult heartworms and microfilariae prior to initiating treatment with INTERCEPTOR.
Do not use in kittens less than six weeks of age or less than 1.5 lbs. body weight.
Do not administer this medication to animals with a known or suspected allergy/hypersensitivity to it or any of its ingredients. Allergic reactions to medications may occur. Please inform Vetsource and your veterinarian if your pet has any known sensitivities or allergies, especially to medications and supplements.
If your pet displays symptoms of an allergic reaction, discontinue therapy and call your veterinarian immediately or seek emergency veterinary attention. Symptoms may include (but are not limited to): swollen lips, tongue, face, or airways; difficulty breathing; agitation; profuse salivation; and widespread hives or itching.
Food and drug interactions
While there are no documented food or drug interactions reported for this medication at the recommended dosage, potential interactions may still be possible. As with all medications, please consult your veterinarian if you have any questions or concerns prior to use. Contact your veterinarian if your pet experiences any unusual reactions when multiple medications and/or supplements are given together.
Please ensure your veterinarian is aware of all medications, supplements, and over-the-counter (OTC) products that your pet is currently using. Your veterinarian may prescribe multiple medications, even if a potential drug interaction may occur. In these instances, your veterinarian may adjust the dosages or monitor your pet more closely.
Adverse reactions
If you are concerned that your pet has experienced an adverse reaction to this medication, please contact Elanco at 1-888-545-5973 or Vetsource Pet Owner Care at 877-738-4443.
Overdose
If you have any reason to suspect accidental ingestion or overdose, call your doctor/veterinarian or the appropriate poison control resource immediately.
For humans:
The national toll-free Poison Help line, 1-800-222-1222, will connect you to your local poison center in case of emergency. This service is available nationwide and in most U.S. territories.
For animals:
The ASPCA Animal Poison Control Center is available 24 hours a day, 365 days a year at 888-426-4435.
Pet Poison Helpline also provides a 24/7 animal poison control service at 855-764-7661.
*Please note: The contact information provided above is for third-party services in the event of a potential poison-related emergency. Consultation fees may apply for these services.
Disclaimer
The content provided on this page is NOT medical advice.
All content, including the images and product description above, is intended for general informational purposes only and should not be considered a substitute for professional veterinary consultation, diagnosis, or treatment.
For additional information about this product and how it fits into your pet's individual treatment plan, please consult your veterinarian.
Last revised: 6/29/2026