Interceptor Spectrum Chewables for Medium Dogs 22–44 lbs (10–20 kg) (Yellow)
Interceptor Spectrum Chewables for Medium Dogs 22–44 lbs (10–20 kg) — one beef-flavoured monthly chew that prevents heartworm and treats roundworm, hookworm, whipworm and tapeworm. Made by Elanco (also sold as Interceptor Plus in the USA and Canada). Approved by the FDA in the USA, Health Canada in Canada, the EMA in Europe and the APVMA in Australia. Ships USA, Canada and worldwide — no vet prescription required.
5-in-1 monthly protection — heartworm plus every major intestinal worm
Interceptor Spectrum is one of the most complete monthly wormers on the market. A single beef-flavoured chew prevents heartworm disease and treats all four of the intestinal worms that cause the most damage in medium dogs: roundworm, hookworm, whipworm and tapeworm. That replaces three separate products with one chew — one prescription-free, vet-grade dose every 30 days.
The combination of milbemycin oxime and praziquantel makes Interceptor Spectrum a smart, simple way to handle internal parasites in one go. The only thing it doesn't do is fleas and ticks — which is by design, because the strongest flea-and-tick chews on the market work best when paired with a dedicated heartworm/wormer rather than rolled into one tablet.
Sized specifically for medium dogs 22–44 lbs
The Yellow pack of Interceptor Spectrum is dosed for medium dogs in the 22–44 lbs (10–20 kg) weight band. That covers most Beagles, French Bulldogs, Cocker Spaniels, Border Terriers, Cavoodles, Miniature Australian Shepherds, Welsh Corgis and Staffordshire Bull Terriers. Weigh your dog before each refill to make sure they're still in the right band — underdosing reduces efficacy, especially against heartworm.
What Interceptor Spectrum protects against
- Heartworm (Dirofilaria immitis) — prevents the larvae transmitted by mosquito bites from developing into adult heartworms. The single most important monthly dose for any dog living in a heartworm-endemic region.
- Roundworms (Toxocara canis, Toxascaris leonina) — including the immature stages most wormers miss.
- Hookworms (Ancylostoma caninum, Uncinaria stenocephala) — responsible for blood loss and anaemia in young puppies.
- Whipworms (Trichuris vulpis) — one of the hardest intestinal worms to clear in adult dogs.
- Tapeworms (Dipylidium caninum, Taenia species, Echinococcus granulosus / hydatid tapeworm) — including the flea-transmitted tapeworm and the public-health-critical hydatid tapeworm.
How Interceptor Spectrum works
The active ingredients are milbemycin oxime (the heartworm preventative and roundworm/hookworm/whipworm treatment) and praziquantel (the gold-standard tapeworm treatment). When your dog eats the chew, the actives are absorbed into the bloodstream and gut, where they kill heartworm larvae before they can mature, and kill adult intestinal worms before they can lay eggs.
Because the actives clear from the body within a few days, monthly dosing is essential. Missing a dose creates a gap in heartworm cover that's the biggest risk in a year-round flea/tick/wormer routine.
How to give Interceptor Spectrum
- Give one Yellow chew once every 30 days, year-round in regions with year-round mosquito and worm activity
- Most dogs eat the chew like a treat — give by hand, in a bowl or hidden in soft food
- Best given with or just after a meal — improves absorption of milbemycin oxime
- Mark the same date each month on your calendar; consistency is what keeps heartworm cover unbroken
- If you miss a dose by more than 8 weeks, talk to your vet — a heartworm test before resuming dosing is sometimes recommended
Why owners choose Interceptor Spectrum
- 5 parasites in one chew — heartworm plus all four major intestinal worms in a single beef-flavoured tablet
- No prescription needed on smartwaypetsupplies.com — sold over the counter to the USA, Canada and worldwide
- Same active combination as the US/Canada product sold as Interceptor Plus (Elanco)
- Beef-flavoured oral chew rather than a topical — no greasy residue, won't wash off, safer around children and other pets
- Wide safety margin — approved for puppies from 6 weeks of age and at least 2 lbs (1 kg)
- Cleaner pairing with long-duration flea/tick chews like Bravecto (12-week protection) than combo all-in-ones
Pack options
- 3 Pack — three months of cover
- 6 Pack — six months of cover; the best value per dose and the most popular choice for owners who dose year-round
For full year-round protection you need 12 chews per year. Two 6-packs cover a full year and work out significantly cheaper per dose than four 3-packs.
Active ingredients
Milbemycin oxime and praziquantel. Each Interceptor Spectrum Yellow chew is dosed to the 22–44 lbs (10–20 kg) weight band. Strength details are on the manufacturer's leaflet inside every pack.
Safety and side effects
Interceptor Spectrum has a wide safety margin and is well-tolerated in dogs from 6 weeks of age and at least 2 lbs (1 kg) bodyweight. The most common side effects, when they occur at all, are mild and short-lived — reduced appetite, mild lethargy or soft stool in the 24 hours after dosing. Talk to your vet before use if your dog has a history of seizures or is being used for breeding. Safe to combine with flea/tick chews like NexGard and Bravecto and with any topical flea/tick product. Do not give to cats — they need a cat-specific monthly wormer and heartworm preventative.
What Interceptor Spectrum doesn't cover
Interceptor Spectrum prevents heartworm and treats intestinal worms only. It does not kill fleas or ticks. For complete year-round parasite protection, pair Interceptor Spectrum with a monthly flea and tick product:
- 12-week flea and tick chew — a 12-week Bravecto chew every 3 months (4 doses per year) is the most convenient pairing
- Monthly flea and tick chew — NexGard or Simparica every 30 days, given on the same date as Interceptor Spectrum
If you'd rather a single all-in-one tablet that covers fleas, ticks, heartworm and worms in one chew, NexGard Spectra and Simparica Trio are both options — though many vets prefer the Interceptor Spectrum + Bravecto pairing because each product is best-in-class at what it does.
Worldwide shipping — no prescription required
We ship Interceptor Spectrum to the USA, Canada, UK, Europe, New Zealand and worldwide. No vet prescription needed. International tracking included on every order.
Frequently Asked Questions
Q: Is Interceptor Spectrum the same as Interceptor Plus?
A: Yes — same product, different name by region. Both contain milbemycin oxime and praziquantel at the same strengths. In Australia and New Zealand it's branded Interceptor Spectrum; in the USA and Canada Elanco sells it as Interceptor Plus. The chews, the dosing, the efficacy and the manufacturer are all identical.
Q: Does Interceptor Spectrum kill fleas or ticks?
A: No. Interceptor Spectrum covers heartworm and intestinal worms only — it does not kill fleas or ticks. For complete parasite protection you need to pair it with a flea and tick chew such as Bravecto (12-week) or NexGard (monthly).
Q: How is Interceptor Spectrum different from Sentinel Spectrum?
A: Sentinel Spectrum contains the same two actives plus lufenuron — an insect growth regulator that stops flea eggs and larvae from developing. Lufenuron doesn't kill adult fleas, so Sentinel Spectrum is most useful in low flea-pressure environments. In most cases, pairing Interceptor Spectrum with a dedicated flea/tick chew like Bravecto or NexGard gives better real-world flea control.
Q: How often do I give Interceptor Spectrum?
A: Once every 30 days, year-round. Heartworm prevention only works with unbroken monthly dosing — missing a dose by more than a few weeks can leave a gap in cover. Mark the same date each month on your calendar.
Q: Can I give Interceptor Spectrum with food?
A: Yes — and it's recommended. Giving the chew with or just after a meal improves the absorption of milbemycin oxime and reduces the rare chance of a temporary upset stomach.
Q: What if I miss a dose?
A: If you miss a dose by less than 2 weeks, give it as soon as you remember and continue monthly from there. If you miss by more than 8 weeks, contact your vet — a heartworm test before resuming dosing is sometimes recommended because adult heartworm infection requires different treatment.
Q: Is Interceptor Spectrum safe for puppies?
A: Yes — it's approved for puppies from 6 weeks of age and at least 2 lbs (1 kg) bodyweight. It's commonly used by breeders and rescues as the first heartworm and worming product after the standard 2/4/6/8-week puppy worming schedule.
Q: Is Interceptor Spectrum safe for MDR1-affected breeds?
A: Yes. Milbemycin oxime has been extensively studied in MDR1-affected breeds (Collies, Australian Shepherds, Shelties, Long-haired Whippets and Old English Sheepdogs) and is considered safe at label dose. As with any medication for MDR1 breeds, mention your dog's MDR1 status to your vet so it's on file.
Q: Can I switch to Interceptor Spectrum from another heartworm product?
A: Yes. If you're moving from Heartgard Plus (a heartworm-only tablet) or a separate heartworm + wormer combo, give Interceptor Spectrum on the date your previous monthly dose was due. If you're moving from a 6- or 12-month injectable heartworm product, ask your vet for the right transition date.
Q: Does Interceptor Spectrum kill hydatid tapeworm?
A: Yes — praziquantel kills Echinococcus granulosus, the hydatid tapeworm. Important for working dogs, hunting dogs and any dog with access to raw offal, since hydatid is a serious public-health risk for humans.
Q: How many chews do I need per year?
A: 12 chews for full year-round cover (one every 30 days). Two 6-packs cover a full year and work out cheaper per dose than four 3-packs.
Original: $57.81
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Interceptor Spectrum Chewables for Medium Dogs 22–44 lbs (10–20 kg) (Yellow)
Interceptor Spectrum Chewables for Medium Dogs 22–44 lbs (10–20 kg) — one beef-flavoured monthly chew that prevents heartworm and treats roundworm, hookworm, whipworm and tapeworm. Made by Elanco (also sold as Interceptor Plus in the USA and Canada). Approved by the FDA in the USA, Health Canada in Canada, the EMA in Europe and the APVMA in Australia. Ships USA, Canada and worldwide — no vet prescription required.
5-in-1 monthly protection — heartworm plus every major intestinal worm
Interceptor Spectrum is one of the most complete monthly wormers on the market. A single beef-flavoured chew prevents heartworm disease and treats all four of the intestinal worms that cause the most damage in medium dogs: roundworm, hookworm, whipworm and tapeworm. That replaces three separate products with one chew — one prescription-free, vet-grade dose every 30 days.
The combination of milbemycin oxime and praziquantel makes Interceptor Spectrum a smart, simple way to handle internal parasites in one go. The only thing it doesn't do is fleas and ticks — which is by design, because the strongest flea-and-tick chews on the market work best when paired with a dedicated heartworm/wormer rather than rolled into one tablet.
Sized specifically for medium dogs 22–44 lbs
The Yellow pack of Interceptor Spectrum is dosed for medium dogs in the 22–44 lbs (10–20 kg) weight band. That covers most Beagles, French Bulldogs, Cocker Spaniels, Border Terriers, Cavoodles, Miniature Australian Shepherds, Welsh Corgis and Staffordshire Bull Terriers. Weigh your dog before each refill to make sure they're still in the right band — underdosing reduces efficacy, especially against heartworm.
What Interceptor Spectrum protects against
- Heartworm (Dirofilaria immitis) — prevents the larvae transmitted by mosquito bites from developing into adult heartworms. The single most important monthly dose for any dog living in a heartworm-endemic region.
- Roundworms (Toxocara canis, Toxascaris leonina) — including the immature stages most wormers miss.
- Hookworms (Ancylostoma caninum, Uncinaria stenocephala) — responsible for blood loss and anaemia in young puppies.
- Whipworms (Trichuris vulpis) — one of the hardest intestinal worms to clear in adult dogs.
- Tapeworms (Dipylidium caninum, Taenia species, Echinococcus granulosus / hydatid tapeworm) — including the flea-transmitted tapeworm and the public-health-critical hydatid tapeworm.
How Interceptor Spectrum works
The active ingredients are milbemycin oxime (the heartworm preventative and roundworm/hookworm/whipworm treatment) and praziquantel (the gold-standard tapeworm treatment). When your dog eats the chew, the actives are absorbed into the bloodstream and gut, where they kill heartworm larvae before they can mature, and kill adult intestinal worms before they can lay eggs.
Because the actives clear from the body within a few days, monthly dosing is essential. Missing a dose creates a gap in heartworm cover that's the biggest risk in a year-round flea/tick/wormer routine.
How to give Interceptor Spectrum
- Give one Yellow chew once every 30 days, year-round in regions with year-round mosquito and worm activity
- Most dogs eat the chew like a treat — give by hand, in a bowl or hidden in soft food
- Best given with or just after a meal — improves absorption of milbemycin oxime
- Mark the same date each month on your calendar; consistency is what keeps heartworm cover unbroken
- If you miss a dose by more than 8 weeks, talk to your vet — a heartworm test before resuming dosing is sometimes recommended
Why owners choose Interceptor Spectrum
- 5 parasites in one chew — heartworm plus all four major intestinal worms in a single beef-flavoured tablet
- No prescription needed on smartwaypetsupplies.com — sold over the counter to the USA, Canada and worldwide
- Same active combination as the US/Canada product sold as Interceptor Plus (Elanco)
- Beef-flavoured oral chew rather than a topical — no greasy residue, won't wash off, safer around children and other pets
- Wide safety margin — approved for puppies from 6 weeks of age and at least 2 lbs (1 kg)
- Cleaner pairing with long-duration flea/tick chews like Bravecto (12-week protection) than combo all-in-ones
Pack options
- 3 Pack — three months of cover
- 6 Pack — six months of cover; the best value per dose and the most popular choice for owners who dose year-round
For full year-round protection you need 12 chews per year. Two 6-packs cover a full year and work out significantly cheaper per dose than four 3-packs.
Active ingredients
Milbemycin oxime and praziquantel. Each Interceptor Spectrum Yellow chew is dosed to the 22–44 lbs (10–20 kg) weight band. Strength details are on the manufacturer's leaflet inside every pack.
Safety and side effects
Interceptor Spectrum has a wide safety margin and is well-tolerated in dogs from 6 weeks of age and at least 2 lbs (1 kg) bodyweight. The most common side effects, when they occur at all, are mild and short-lived — reduced appetite, mild lethargy or soft stool in the 24 hours after dosing. Talk to your vet before use if your dog has a history of seizures or is being used for breeding. Safe to combine with flea/tick chews like NexGard and Bravecto and with any topical flea/tick product. Do not give to cats — they need a cat-specific monthly wormer and heartworm preventative.
What Interceptor Spectrum doesn't cover
Interceptor Spectrum prevents heartworm and treats intestinal worms only. It does not kill fleas or ticks. For complete year-round parasite protection, pair Interceptor Spectrum with a monthly flea and tick product:
- 12-week flea and tick chew — a 12-week Bravecto chew every 3 months (4 doses per year) is the most convenient pairing
- Monthly flea and tick chew — NexGard or Simparica every 30 days, given on the same date as Interceptor Spectrum
If you'd rather a single all-in-one tablet that covers fleas, ticks, heartworm and worms in one chew, NexGard Spectra and Simparica Trio are both options — though many vets prefer the Interceptor Spectrum + Bravecto pairing because each product is best-in-class at what it does.
Worldwide shipping — no prescription required
We ship Interceptor Spectrum to the USA, Canada, UK, Europe, New Zealand and worldwide. No vet prescription needed. International tracking included on every order.
Frequently Asked Questions
Q: Is Interceptor Spectrum the same as Interceptor Plus?
A: Yes — same product, different name by region. Both contain milbemycin oxime and praziquantel at the same strengths. In Australia and New Zealand it's branded Interceptor Spectrum; in the USA and Canada Elanco sells it as Interceptor Plus. The chews, the dosing, the efficacy and the manufacturer are all identical.
Q: Does Interceptor Spectrum kill fleas or ticks?
A: No. Interceptor Spectrum covers heartworm and intestinal worms only — it does not kill fleas or ticks. For complete parasite protection you need to pair it with a flea and tick chew such as Bravecto (12-week) or NexGard (monthly).
Q: How is Interceptor Spectrum different from Sentinel Spectrum?
A: Sentinel Spectrum contains the same two actives plus lufenuron — an insect growth regulator that stops flea eggs and larvae from developing. Lufenuron doesn't kill adult fleas, so Sentinel Spectrum is most useful in low flea-pressure environments. In most cases, pairing Interceptor Spectrum with a dedicated flea/tick chew like Bravecto or NexGard gives better real-world flea control.
Q: How often do I give Interceptor Spectrum?
A: Once every 30 days, year-round. Heartworm prevention only works with unbroken monthly dosing — missing a dose by more than a few weeks can leave a gap in cover. Mark the same date each month on your calendar.
Q: Can I give Interceptor Spectrum with food?
A: Yes — and it's recommended. Giving the chew with or just after a meal improves the absorption of milbemycin oxime and reduces the rare chance of a temporary upset stomach.
Q: What if I miss a dose?
A: If you miss a dose by less than 2 weeks, give it as soon as you remember and continue monthly from there. If you miss by more than 8 weeks, contact your vet — a heartworm test before resuming dosing is sometimes recommended because adult heartworm infection requires different treatment.
Q: Is Interceptor Spectrum safe for puppies?
A: Yes — it's approved for puppies from 6 weeks of age and at least 2 lbs (1 kg) bodyweight. It's commonly used by breeders and rescues as the first heartworm and worming product after the standard 2/4/6/8-week puppy worming schedule.
Q: Is Interceptor Spectrum safe for MDR1-affected breeds?
A: Yes. Milbemycin oxime has been extensively studied in MDR1-affected breeds (Collies, Australian Shepherds, Shelties, Long-haired Whippets and Old English Sheepdogs) and is considered safe at label dose. As with any medication for MDR1 breeds, mention your dog's MDR1 status to your vet so it's on file.
Q: Can I switch to Interceptor Spectrum from another heartworm product?
A: Yes. If you're moving from Heartgard Plus (a heartworm-only tablet) or a separate heartworm + wormer combo, give Interceptor Spectrum on the date your previous monthly dose was due. If you're moving from a 6- or 12-month injectable heartworm product, ask your vet for the right transition date.
Q: Does Interceptor Spectrum kill hydatid tapeworm?
A: Yes — praziquantel kills Echinococcus granulosus, the hydatid tapeworm. Important for working dogs, hunting dogs and any dog with access to raw offal, since hydatid is a serious public-health risk for humans.
Q: How many chews do I need per year?
A: 12 chews for full year-round cover (one every 30 days). Two 6-packs cover a full year and work out cheaper per dose than four 3-packs.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Interceptor Spectrum Chewables for Medium Dogs 22–44 lbs (10–20 kg) — one beef-flavoured monthly chew that prevents heartworm and treats roundworm, hookworm, whipworm and tapeworm. Made by Elanco (also sold as Interceptor Plus in the USA and Canada). Approved by the FDA in the USA, Health Canada in Canada, the EMA in Europe and the APVMA in Australia. Ships USA, Canada and worldwide — no vet prescription required.
5-in-1 monthly protection — heartworm plus every major intestinal worm
Interceptor Spectrum is one of the most complete monthly wormers on the market. A single beef-flavoured chew prevents heartworm disease and treats all four of the intestinal worms that cause the most damage in medium dogs: roundworm, hookworm, whipworm and tapeworm. That replaces three separate products with one chew — one prescription-free, vet-grade dose every 30 days.
The combination of milbemycin oxime and praziquantel makes Interceptor Spectrum a smart, simple way to handle internal parasites in one go. The only thing it doesn't do is fleas and ticks — which is by design, because the strongest flea-and-tick chews on the market work best when paired with a dedicated heartworm/wormer rather than rolled into one tablet.
Sized specifically for medium dogs 22–44 lbs
The Yellow pack of Interceptor Spectrum is dosed for medium dogs in the 22–44 lbs (10–20 kg) weight band. That covers most Beagles, French Bulldogs, Cocker Spaniels, Border Terriers, Cavoodles, Miniature Australian Shepherds, Welsh Corgis and Staffordshire Bull Terriers. Weigh your dog before each refill to make sure they're still in the right band — underdosing reduces efficacy, especially against heartworm.
What Interceptor Spectrum protects against
- Heartworm (Dirofilaria immitis) — prevents the larvae transmitted by mosquito bites from developing into adult heartworms. The single most important monthly dose for any dog living in a heartworm-endemic region.
- Roundworms (Toxocara canis, Toxascaris leonina) — including the immature stages most wormers miss.
- Hookworms (Ancylostoma caninum, Uncinaria stenocephala) — responsible for blood loss and anaemia in young puppies.
- Whipworms (Trichuris vulpis) — one of the hardest intestinal worms to clear in adult dogs.
- Tapeworms (Dipylidium caninum, Taenia species, Echinococcus granulosus / hydatid tapeworm) — including the flea-transmitted tapeworm and the public-health-critical hydatid tapeworm.
How Interceptor Spectrum works
The active ingredients are milbemycin oxime (the heartworm preventative and roundworm/hookworm/whipworm treatment) and praziquantel (the gold-standard tapeworm treatment). When your dog eats the chew, the actives are absorbed into the bloodstream and gut, where they kill heartworm larvae before they can mature, and kill adult intestinal worms before they can lay eggs.
Because the actives clear from the body within a few days, monthly dosing is essential. Missing a dose creates a gap in heartworm cover that's the biggest risk in a year-round flea/tick/wormer routine.
How to give Interceptor Spectrum
- Give one Yellow chew once every 30 days, year-round in regions with year-round mosquito and worm activity
- Most dogs eat the chew like a treat — give by hand, in a bowl or hidden in soft food
- Best given with or just after a meal — improves absorption of milbemycin oxime
- Mark the same date each month on your calendar; consistency is what keeps heartworm cover unbroken
- If you miss a dose by more than 8 weeks, talk to your vet — a heartworm test before resuming dosing is sometimes recommended
Why owners choose Interceptor Spectrum
- 5 parasites in one chew — heartworm plus all four major intestinal worms in a single beef-flavoured tablet
- No prescription needed on smartwaypetsupplies.com — sold over the counter to the USA, Canada and worldwide
- Same active combination as the US/Canada product sold as Interceptor Plus (Elanco)
- Beef-flavoured oral chew rather than a topical — no greasy residue, won't wash off, safer around children and other pets
- Wide safety margin — approved for puppies from 6 weeks of age and at least 2 lbs (1 kg)
- Cleaner pairing with long-duration flea/tick chews like Bravecto (12-week protection) than combo all-in-ones
Pack options
- 3 Pack — three months of cover
- 6 Pack — six months of cover; the best value per dose and the most popular choice for owners who dose year-round
For full year-round protection you need 12 chews per year. Two 6-packs cover a full year and work out significantly cheaper per dose than four 3-packs.
Active ingredients
Milbemycin oxime and praziquantel. Each Interceptor Spectrum Yellow chew is dosed to the 22–44 lbs (10–20 kg) weight band. Strength details are on the manufacturer's leaflet inside every pack.
Safety and side effects
Interceptor Spectrum has a wide safety margin and is well-tolerated in dogs from 6 weeks of age and at least 2 lbs (1 kg) bodyweight. The most common side effects, when they occur at all, are mild and short-lived — reduced appetite, mild lethargy or soft stool in the 24 hours after dosing. Talk to your vet before use if your dog has a history of seizures or is being used for breeding. Safe to combine with flea/tick chews like NexGard and Bravecto and with any topical flea/tick product. Do not give to cats — they need a cat-specific monthly wormer and heartworm preventative.
What Interceptor Spectrum doesn't cover
Interceptor Spectrum prevents heartworm and treats intestinal worms only. It does not kill fleas or ticks. For complete year-round parasite protection, pair Interceptor Spectrum with a monthly flea and tick product:
- 12-week flea and tick chew — a 12-week Bravecto chew every 3 months (4 doses per year) is the most convenient pairing
- Monthly flea and tick chew — NexGard or Simparica every 30 days, given on the same date as Interceptor Spectrum
If you'd rather a single all-in-one tablet that covers fleas, ticks, heartworm and worms in one chew, NexGard Spectra and Simparica Trio are both options — though many vets prefer the Interceptor Spectrum + Bravecto pairing because each product is best-in-class at what it does.
Worldwide shipping — no prescription required
We ship Interceptor Spectrum to the USA, Canada, UK, Europe, New Zealand and worldwide. No vet prescription needed. International tracking included on every order.
Frequently Asked Questions
Q: Is Interceptor Spectrum the same as Interceptor Plus?
A: Yes — same product, different name by region. Both contain milbemycin oxime and praziquantel at the same strengths. In Australia and New Zealand it's branded Interceptor Spectrum; in the USA and Canada Elanco sells it as Interceptor Plus. The chews, the dosing, the efficacy and the manufacturer are all identical.
Q: Does Interceptor Spectrum kill fleas or ticks?
A: No. Interceptor Spectrum covers heartworm and intestinal worms only — it does not kill fleas or ticks. For complete parasite protection you need to pair it with a flea and tick chew such as Bravecto (12-week) or NexGard (monthly).
Q: How is Interceptor Spectrum different from Sentinel Spectrum?
A: Sentinel Spectrum contains the same two actives plus lufenuron — an insect growth regulator that stops flea eggs and larvae from developing. Lufenuron doesn't kill adult fleas, so Sentinel Spectrum is most useful in low flea-pressure environments. In most cases, pairing Interceptor Spectrum with a dedicated flea/tick chew like Bravecto or NexGard gives better real-world flea control.
Q: How often do I give Interceptor Spectrum?
A: Once every 30 days, year-round. Heartworm prevention only works with unbroken monthly dosing — missing a dose by more than a few weeks can leave a gap in cover. Mark the same date each month on your calendar.
Q: Can I give Interceptor Spectrum with food?
A: Yes — and it's recommended. Giving the chew with or just after a meal improves the absorption of milbemycin oxime and reduces the rare chance of a temporary upset stomach.
Q: What if I miss a dose?
A: If you miss a dose by less than 2 weeks, give it as soon as you remember and continue monthly from there. If you miss by more than 8 weeks, contact your vet — a heartworm test before resuming dosing is sometimes recommended because adult heartworm infection requires different treatment.
Q: Is Interceptor Spectrum safe for puppies?
A: Yes — it's approved for puppies from 6 weeks of age and at least 2 lbs (1 kg) bodyweight. It's commonly used by breeders and rescues as the first heartworm and worming product after the standard 2/4/6/8-week puppy worming schedule.
Q: Is Interceptor Spectrum safe for MDR1-affected breeds?
A: Yes. Milbemycin oxime has been extensively studied in MDR1-affected breeds (Collies, Australian Shepherds, Shelties, Long-haired Whippets and Old English Sheepdogs) and is considered safe at label dose. As with any medication for MDR1 breeds, mention your dog's MDR1 status to your vet so it's on file.
Q: Can I switch to Interceptor Spectrum from another heartworm product?
A: Yes. If you're moving from Heartgard Plus (a heartworm-only tablet) or a separate heartworm + wormer combo, give Interceptor Spectrum on the date your previous monthly dose was due. If you're moving from a 6- or 12-month injectable heartworm product, ask your vet for the right transition date.
Q: Does Interceptor Spectrum kill hydatid tapeworm?
A: Yes — praziquantel kills Echinococcus granulosus, the hydatid tapeworm. Important for working dogs, hunting dogs and any dog with access to raw offal, since hydatid is a serious public-health risk for humans.
Q: How many chews do I need per year?
A: 12 chews for full year-round cover (one every 30 days). Two 6-packs cover a full year and work out cheaper per dose than four 3-packs.
