Drug type: Generic ingredient
• Generic profile • No FDA branded products linked
BothTabletRx required100% storefront ready
Species: Both
Manufacturer:
Merck Sharp & Dohme Corp.
Medication Snapshot
Merged from the current Roxee medication system with field-level provenance, freshness, and completeness tracking.
Milbemycin Oxime, Lufenuron
For use in dogs and puppies for the prevention of heartworm disease caused by Dirofilaria immitis , for prevention and control of flea populations, control of adult Ancylostoma caninum (hookworm), and removal and control of adult Toxocara canis , Toxascaris leonine (roundworm), and Trichuris vulpis (whipworm) infections. Lufenuron controls flea populations by preventing the development of flea eggs and does not kill adult fleas. Concurrent use of insecticides may be necessary for adequate control of adult fleas. The concurrent use of flavored milbemycin oxime and lufenuron tablets is indicated to kill adult fleas and prevent flea eggs from hatching. Species commonly shown: Both, Dog, Excluding Under 2 Pounds, Dogs and puppies, excluding puppies under 4 weeks age.
Generic name
Milbemycin Oxime, Lufenuron
Brand names
Sentinel® Flavor Tabs®
Manufacturer
Merck Sharp & Dohme Corp.
Species
Both, Dog, Excluding Under 2 Pounds, Dogs and puppies, excluding puppies under 4 weeks age
Dosage forms
Tablet
Prescription
Prescription required
Completeness
100%
Validation
Complete
Brand names
Sentinel® Flavor Tabs®
Dosage forms
Tablet
Indications / Uses
For use in dogs and puppies for the prevention of heartworm disease caused by Dirofilaria immitis , for prevention and control of flea populations, control of adult Ancylostoma caninum (hookworm), and removal and control of adult Toxocara canis , Toxascaris leonine (roundworm), and Trichuris vulpis (whipworm) infections. Lufenuron controls flea populations by preventing the development of flea eggs and does not kill adult fleas. Concurrent use of insecticides may be necessary for adequate control of adult fleas. The concurrent use of flavored milbemycin oxime and lufenuron tablets is indicated to kill adult fleas and prevent flea eggs from hatching.
Warnings / Contraindications
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. Administer tablets once a month, preferably on the same date each time. All dogs in a household should be treated to achieve maximum efficacy. Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal..
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. Administer tablets once a month, preferably on the same date each time. All dogs in a household should be treated to achieve maximum efficacy. Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal..
Side Effects
Top reported reactions (openFDA): Lack of efficacy (endoparasite) - hookworm, INEFFECTIVE, HEARTWORM LARVAE, Vomiting, INEFFECTIVE, ASCARIDS NOS, Diarrhoea, Lethargy (see also Central nervous system depression in 'Neurological').
FAQ
Both, Dog, Excluding Under 2 Pounds, Dogs and puppies, excluding puppies under 4 weeks age
Start here first for the safest next-step summary before the deeper medication detail.
Used for:
For use in dogs and puppies for the prevention of heartworm disease caused by Dirofilaria immitis , for prevention and control of flea populations, control of adult Ancylostoma caninum (hookworm), and removal and control...
Dosing note:
Exact dosing depends on your pet's species, weight, and health status. Use your veterinarian's instructions for the exact dose and schedule.
What to watch for:
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian
Administer tablets once a month, preferably on the same date each time
All dogs in a household should be treated to achieve maximum efficacy
Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal
Lack of efficacy - tapeworm (1 reports)
Lack of efficacy - heartworm (1 reports)
Hypophosphataemia (1 reports)
When to call the vet:
Repeated vomiting or diarrhea.
Severe lethargy (hard to wake, very low energy).
Collapse or fainting.
Trouble breathing.
Facial swelling or hives.
Blood in vomit or stool.
What to tell or ask your vet today:
Is this medicine the right fit for my pet’s current symptoms?
Which warning signs mean I should call back right away?
How should I handle missed doses or refusal to take the medicine?
Major cautions & emergency warning signs
Side effects to monitor:
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian
Administer tablets once a month, preferably on the same date each time
All dogs in a household should be treated to achieve maximum efficacy
Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal
Lack of efficacy - tapeworm
Most reported reactions:
Lack of efficacy (endoparasite) - tapeworm (1 reports)
Lack of efficacy (endoparasite) - heartworm (1 reports)
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. Administer tablets once a month, preferably on the same date each time. All dogs in a household should be treated to achieve maximum efficacy. Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal..
High: Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. Administer tablets once a month, preferably on the same date each time. All dogs in a household should be treated to achieve maximum efficacy. Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal..
Dogs and Puppies (4 Weeks and Older; 2 Lbs or Greater)
Indication
For use in dogs and puppies for the prevention of heartworm disease caused by Dirofilaria immitis, for prevention and control of flea populations, control of adult Ancylostoma caninum (hookworm), and removal and control of adult Toxocara canis, Toxascaris leonine (roundworm), and Trichuris vulpis (whipworm) infections. Lufenuron controls flea populations by preventing the development of flea eggs and does not kill adult fleas. Concurrent use of insecticides may be necessary for adequate control of adult fleas. The concurrent use of flavored milbemycin oxime and lufenuron tablets is indicated to kill adult fleas and prevent flea eggs from hatching.
Dosage
SENTINEL FLAVOR TABS are given orally, once a month, at the recommended minimum dosage of 0.23 mg/lb (0.5 mg/kg) milbemycin oxime and 4.55 mg/lb (10mg/kg) lufenuron.
Limitations
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian.
Administer tablets once a month, preferably on the same date each time. All dogs in a household should be treated to achieve maximum efficacy. Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight
To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal..
Global Pet owner/Vet mode is controlled in the header. This section avoids duplicate in-page persona tabs.
Owner-facing counseling points
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. Administer tablets once a month, preferably on the same date each time. All dogs in a household should be treated to achieve maximum efficacy. Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal.. (Contraindication, High)
Top reaction signals
Lack of efficacy (endoparasite) - tapeworm (1)Lack of efficacy (endoparasite) - heartworm (1)Hypophosphataemia (1)Hypokalaemia (1)Fracture (1)Elevated temperature (1)Distress (1)Decreased body temperature (1)
Identifiers & Packages
Normalized identifiers (NDC/NADA/ANADA) and package metadata from regulator listings.
contraindications: Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. Administer tablets once a month, preferably on the same date each t… (Official, 2026-04-25)
contraindications: Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. Administer tablets once a month, preferably on the same date each t… (Official, 2026-04-22)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-05-05)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-05-03)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-05-02)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-04-29)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-04-28)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-04-27)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-04-26)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-04-25)
indications: SENTINEL Tablets are indicated for use in dogs and puppies four weeks of age and older and two pounds body weight or greater, for the prevention of heartworm d… (Official, 2026-04-22)
usage: For use in dogs and puppies for the prevention of heartworm disease caused by Dirofilaria immitis , for prevention and control of flea populations, control of … (Official, 2026-04-25)
usage: For use in dogs and puppies for the prevention of heartworm disease caused by Dirofilaria immitis , for prevention and control of flea populations, control of … (Official, 2026-04-22)
Recent Revisions
side_effects updated 2026-04-25 10:05 by etl_backfill • Backfilled from existing medication fields
contraindications updated 2026-04-25 10:05 by etl_backfill • Backfilled from existing medication fields
usage updated 2026-04-25 10:05 by etl_backfill • Backfilled from existing medication fields
side_effects updated 2026-04-22 10:13 by etl_backfill • Backfilled from existing medication fields
contraindications updated 2026-04-22 10:13 by etl_backfill • Backfilled from existing medication fields
usage updated 2026-04-22 10:13 by etl_backfill • Backfilled from existing medication fields
side_effects updated 2026-04-15 10:04 by etl_backfill • Backfilled from existing medication fields
side_effects updated 2026-04-11 10:05 by etl_backfill • Backfilled from existing medication fields
side_effects updated 2026-02-12 22:44 by etl_backfill • Backfilled from existing medication fields
FDA Products & Applications (Animal Drugs @ FDA)
Official sponsor/proprietary-name/application-status records linked by active ingredient.
Dogs and Puppies (4 Weeks and Older; 2 Lbs or Greater)
Indication
For use in dogs and puppies for the prevention of heartworm disease caused by Dirofilaria immitis, for prevention and control of flea populations, control of adult Ancylostoma caninum (hookworm), and removal and control of adult Toxocara canis, Toxascaris leonine (roundworm), and Trichuris vulpis (whipworm) infections. Lufenuron controls flea populations by preventing the development of flea eggs and does not kill adult fleas. Concurrent use of insecticides may be necessary for adequate control of adult fleas. The concurrent use of flavored milbemycin oxime and lufenuron tablets is indicated to kill adult fleas and prevent flea eggs from hatching.
Dosage
SENTINEL FLAVOR TABS are given orally, once a month, at the recommended minimum dosage of 0.23 mg/lb (0.5 mg/kg) milbemycin oxime and 4.55 mg/lb (10mg/kg) lufenuron.
Limitations
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian.
Administer tablets once a month, preferably on the same date each time. All dogs in a household should be treated to achieve maximum efficacy. Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight
To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal..
For use in dogs and puppies for the prevention of heartworm disease caused by Dirofilaria immitis , for prevention and control of flea populations, control of adult Ancylostoma caninum (hookworm), and removal and control of adult Toxocara canis , Toxascaris leonine (roundworm), and Trichuris vulpis (whipworm) infections. Lufenuron controls flea populations by preventing the development of flea eggs and does not kill adult fleas. Concurrent use of insecticides may be necessary for adequate control of adult fleas. The concurrent use of flavored milbemycin oxime and lufenuron tablets is indicated to kill adult fleas and prevent flea eggs from hatching.
Federal (USA) law restricts this drug to use by or on the order of a licensed veterinarian. Administer tablets once a month, preferably on the same date each time. All dogs in a household should be treated to achieve maximum efficacy. Do not use in dogs less than 4 weeks of age and less than 2 pounds body weight To ensure adequate absorption, always administer sentinel® flavor tabs® to dogs immediately after or in conjunction with a normal meal..
Top Reported Reactions (openFDA)
De-duplicated reaction terms grouped by body system from FDA openFDA reports (not verified; does not prove causation).
Digestive
Vomiting (1) • Cat
Drooling (1) • Cat
Diarrhea (1) • Dog
Decreased appetite (1) • Dog
Bloody diarrhoea (1) • Dog
Show more (1)
Blood in vomit (1) • Dog
Showing top 5 for Digestive.
Neurologic
Unsteady walking (1) • Dog
Tiredness (1) • Cat
Showing top 5 for Neurologic.
Behavior
Anxiety (1) • Cat
Showing top 5 for Behavior.
Effectiveness
Lack of efficacy (endoparasite) - tapeworm (1) • Dog
Lack of efficacy (endoparasite) - roundworm NOS (1) • Dog
Lack of efficacy (endoparasite) - hookworm (1) • Dog
Lack of efficacy (endoparasite) - heartworm (1) • Dog
Showing top 5 for Effectiveness.
Other
Not himself/herself (1) • Dog
Not drinking (1) • Cat
Loose stool (1) • Dog
Increased packed cell volume (1) • Dog
Inappetence (1) • Cat
Show more (14)
Hypophosphataemia (1) • Cat
Hypokalaemia (1) • Cat
Haemorrhagic gastroenteritis (1) • Dog
Fracture (1) • Dog
Elevated temperature (1) • Cat
Elevated blood urea nitrogen (1) • Dog
Drinking a lot (1) • Dog
Distress (1) • Cat
Dehydration (1) • Dog
Decreased body temperature (1) • Cat
Conjunctivitis (1) • Dog
Barking (1) • Dog
Accidental exposure (1) • Cat
Abnormal stool colouration (1) • Dog
Showing top 5 for Other.
Data source: FDA openFDA Animal & Veterinary adverse event reports.
Adverse Event Case Summaries (openFDA)
These are individual FDA adverse event reports. They are unverified and do not prove the medication caused the reaction.
No case-level openFDA reports are linked for this medication yet.
Data source: FDA openFDA Animal & Veterinary adverse event reports.
Overdose Information
No approved overdose-management text is linked yet. If overdose is suspected, contact a veterinarian or emergency clinic immediately.
Storage & Handling
No approved storage guidance is linked yet for this ingredient. Use manufacturer packaging and veterinary guidance for handling/storage.
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Medical Disclaimer: The medication details provided on Roxee are for informational purposes only and are not a substitute for professional veterinary advice. Always consult your veterinarian about your pet's specific needs.