Trifexis (Milbemycin Oxime and Spinosad) Chewable Tablets for Dogs

Trifexis Chewable Tablets are a broad-spectrum veterinary parasite control medication formulated for monthly oral administration in dogs and puppies to kill adult fleas, prevent flea infestations, prevent heartworm disease, and treat and control adult hookworm, roundworm, and whipworm infections. Combining two active pharmaceutical agents—milbemycin oxime and spinosad—this beef-flavored chewable tablet provides comprehensive internal and external parasite protection in a single monthly dose. Because multi-parasite prevention requires accurate weight-based dosing and pre-treatment veterinary screening, administration must follow strict product labeling and clinical supervision.

What Is Trifexis?

Trifexis is a specialized veterinary dual-action parasiticidal compound formulated for monthly oral delivery under professional veterinary supervision.

Active Ingredients and Formulation

• Active Components:

  • Spinosad: An insecticidal compound derived from soil bacteria (Saccharopolyspora spinosa) that rapidly kills adult fleas by exciting the insect nervous system, preventing new flea infestations before eggs can be laid.

  • Milbemycin Oxime: A macrocyclic lactone endoparasiticide that prevents heartworm disease by eliminating tissue larval stages of Dirofilaria immitis, while also treating and controlling adult hookworms (Ancylostoma caninum), roundworms (Toxocara canis, Toxascaris leonina), and whipworms (Trichuris vulpis).

• Vehicle and Presentation: Supplied as beef-flavored chewable tablets packaged in blister packs of 3 or 6 counts, formulated across five distinct weight tiers for dogs and puppies 8 weeks of age and older weighing 5.0 lbs or more.

What Is It Used For?

Primary Veterinary Indications

• Flea Infestation Control: Routinely prescribed by veterinarians to kill adult fleas and rapidly start treating flea infestations.

• Heartworm Disease Prevention: Prevents fatal canine heartworm disease by eliminating heartworm larvae acquired within the past 30 days.

• Intestinal Parasite Management: Treats and controls adult hookworms, roundworms, and whipworms to reduce gastrointestinal parasite burdens.

Administration and Dosage Considerations

Route and Dosing

• Route of Administration: Administered orally once a month, preferably with food or immediately after a meal to ensure maximum efficacy of the spinosad component.

• Weight-Based Dosing Tiers:

  • 5.0 to 10.0 lbs (Yellow box)

  • 10.1 to 20.0 lbs (Blue box)

  • 20.1 to 40.0 lbs (Green box)

  • 40.1 to 60.0 lbs (Orange box)

  • 60.1 to 120.0 lbs (Red box)

• Veterinary Supervision: For dogs weighing over 120 lbs, administer the appropriate combination of chewable tablets. All dogs must be tested for existing heartworm infections by a licensed veterinarian prior to initiating preventative therapy.

Important Safety Information

• Contraindications: Do not use in cats or other animal species. Do not administer to dogs with known hypersensitivity to spinosad or milbemycin oxime. Do not give to puppies under 8 weeks of age or weighing less than 5 lbs. Use with caution in dogs with a history of pre-existing epilepsy or seizures.

• Side Effects and Precautions: Generally well tolerated when given with food. Potential adverse reactions include vomiting, decreased appetite, lethargy, or diarrhea. In dogs with pre-existing seizure disorders, rare neurological events have been reported following spinosad administration.

• Professional Guidance: Ensure dogs consume the entire chewable tablet without breaking or losing fragments. Administering on an empty stomach may occasionally lead to vomiting; always provide food with the dose.

Storage and Handling

• Store at controlled room temperature between 15°C and 30°C (59°F to 86°F). Protect product from excessive moisture and light.

• Keep individual chewables stored securely in their protective blister packaging until ready for immediate administration.

• Keep securely out of reach of children, unauthorized individuals, and pets to prevent accidental overconsumption.

Frequently Asked Questions

What is Trifexis used for?

It is a monthly oral beef-flavored chewable tablet utilized to kill fleas, prevent heartworm disease, and treat roundworms, hookworms, and whipworms in dogs.

What are the active ingredients?

It combines spinosad (for fast flea elimination) and milbemycin oxime (for heartworm prevention and intestinal worm control).

How often should Trifexis be given?

It is administered orally once every month year-round, ideally with food, matched precisely to your dog’s current body weight following veterinary guidance.

Order Trifexis Chews Online

Rx Trifexis Chewable Tablets for Dogs are available for order through our platform subject to veterinary prescription verification and regulatory compliance. For assistance regarding prescription submission, weight tier selection, or secure shipping protocols, please contact our customer support team.