Buy Trifexis Online, rx medicine for dogs

Trifexis (Rx)

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Product Description

Dogs and Puppies are vulnerable to heartworms, fleas, and intestinal parasites attack year around!

Now to keep them protected from different these harmful parasites use Trifexis for Dogs 40.1-60 lbs, 6 Chewable Tablets (Blue), which is a pet prescriptions medicine.

This pet prescription medicine is designed to keep your dog and puppy safe from heartworms, fleas, and intestinal parasites all year. When given once a month, these chewable tablets for dogs kill adult fleas and certain stages of immature heartworms. Plus, it is also effective at eliminating hookworms, roundworms, and whipworms.

Spinosad, an active ingredient in Trifexis, starts to work within 30 minutes to kill fleas. This active ingredient has been found to kill 100% of all biting fleas within 4 hours. Trifexis also kills flea eggs before they can mature, which helps to end the flea life cycle.

This pet prescription medicine by Elanco Animal Health prevents heartworm disease by killing microfilariae and larvae from maturing into adult heartworms.

Protect your dog’s health with Trifexis pet medications. Trifexis is dispensed with the package inserts and instructions but does not include the box.

Now you can order this pet med and other pet prescriptions drugs at our online drug store based in Texas. Order pet meds online and get huge discounts!

We care for your pets!


Dogs and Puppies


Federal (USA) law restricts this dog flea control drug to use by or on the order of a licensed veterinarian.


  • Begins killing biting fleas within 30 minutes of use
  • Kills adult fleas before they can lay eggs
  • Prevents heartworms in dogs
  • Effective treats and controls roundworms, hookworms, and whipworms
  • Artificial beef flavor made from pork liver and hydrolyzed soy
  • Easy-to-administer chewable tablets for dogs


TRIFEXIS, dog flea medicine is indicated for the prevention of heartworms in dogs. TRIFEXIS kills fleas and is indicated for the prevention and treatment of flea infestations and flea symptoms in dogs, and the treatment and control of adult hookworm, adult roundworm and adult whipworm infections in dogs and puppies 8 weeks of age or older and 5 pounds of body weight or greater.

Dosage and Administration:

This flea medicine for dogs is given orally, once a month at the minimum dosage of 13.5 mg/lb (30 mg/kg) spinosad and 0.2 mg/lb (0.5 mg/kg) milbemycin oxime body weight. For heartworm treatment, give once monthly for at least 3 months after exposure to mosquitoes.

Dosage Schedule:

Body WeightSpinosad Per Tablet(mg)Milbemycin oxime Per Tablet (mg)Tablets Administered
5 to 10 lbs1402.3One
10.1 to 20 lbs2704.5One
20.1 to 40 lbs5609.3One
40.1 to 60 lbs81013.5One
60.1 to 120 lbs162027One
Over 120 lbsAdminister the appropriate combination of tablets

Administer TRIFEXIS with food for maximum effectiveness. If a dose is missed for dog flea treatment and a monthly interval between doses is exceeded, then immediate administration of TRIFEXIS with food and resumption of monthly dosing will minimize the opportunity for the development of adult heartworm infections and flea re-infestations.

If vomiting occurs within an hour of administration, re-dose with another full dose.

Heartworm Prevention:

TRIFEXIS for heartworm treatment should be administered at monthly intervals beginning within 1 month of the dog’s first seasonal exposure and continuing until at least 3months after the dog’s last seasonal exposure to mosquitoes. TRIFEXIS may be administered year round without interruption. When replacing another heartworm medicine for dogs, the first dose of TRIFEXIS should be given within a month of the last dose of the former medication.

Flea Treatment and Prevention:

Treatment with TRIFEXIS for best flea treatment for dogs may begin at any time of the year, preferably starting one month before fleas become active and continuing monthly through the end of flea season. In areas where fleas are common year-round, monthly treatment with TRIFEXIS should continue the entire year without interruption.

To minimize the likelihood of flea re-infestation, it is important to treat all animals within a household with an approved flea protection product to deal with flea symptoms in dogs.

Intestinal Nematode Treatment and Control:

TRIFEXIS flea medicine for dogs also provides treatment and control of roundworms, hookworms and whipworms. Dogs may be exposed to and can become infected with roundworms, whipworms and hookworms throughout the year, regardless of season or climate. Clients should be advised of measures to be taken to prevent re-infection with intestinal parasites.


There are no known contraindications to the use of TRIFEXIS.


Not for human use. Keep this and all drugs out of the reach of children. Serious adverse reactions have been reported following concomitant extra-label use of ivermectin with spinosad alone, a component of TRIFEXIS, one of the best dog medications.


Treatment with this dog flea medicine with fewer than 3 monthly doses after the last exposure to mosquitoes may not provide complete heartworm prevention.

Prior to administration of TRIFEXIS dog flea control medicine, dogs should be tested for existing heartworm infection. At the discretion of the veterinarian, infected dogs should be treated with an adulticide to remove adult heartworms. TRIFEXIS is not effective against adult D. immitis. While the number of circulating microfilariae may decrease following treatment, TRIFEXIS is not indicated for microfilariae clearance.

Mild, transient hypersensitivity reactions manifested as labored respiration, vomiting, salivation and lethargy, have been noted in some dogs treated with milbemycin oxime carrying a high number of circulating microfilariae. These reactions are presumably caused by release of protein from dead or dying microfilariae.

Use with caution in breeding females. The safe use of TRIFEXIS flea medicine for dogs in breeding males has not been evaluated.

Use with caution in dogs with pre-existing epilepsy.

Puppies less than 14 weeks of age may experience a higher rate of vomiting.

Adverse Reactions:

In a well-controlled US field study, which included a total of 352 dogs (176 treated with TRIFEXIS and 176 treated with an active control), no serious adverse reactions were attributed to administration of TRIFEXIS.

All reactions were regarded as mild. Over the 180-day study period, all observations of potential adverse reactions were recorded. Reactions that occurred at an incidence >1% (average monthly rate) within any of the 6 months of observation are presented in the following table. The most frequently reported adverse reaction in dogs in the TRIFEXIS group was vomiting.

Average Monthly Rate (%) of Dogs with Adverse Reactions

Adverse ReactionTRIFEXIS Chewable TabletsActive Control Tablets
Skin Reddening1.371.26
Decreased appetite1.271.35
Pinnal Reddening1.180.87

In the US field study, one dog administered TRIFEXIS flea medicine experienced a single mild seizure 21/2hours after receiving the second monthly dose. The dog remained enrolled and received four additional monthly doses after the event and completed the study without further incident.

Following concomitant extra-label use of ivermectin with spinosad alone, a component of TRIFEXIS, dog flea control medicine, some dogs have experienced the following clinical signs: trembling/twitching, salivation/drooling, seizures, ataxia, mydriasis, blindness and disorientation. Spinosad alone has been shown to be safe when administered concurrently with heartworm preventatives at label directions.

In US and European field studies, no dogs experienced seizures when dosed with spinosad alone at the therapeutic dose range of 13.5-27.3 mg/lb (30-60 mg/kg), including 4 dogs with pre-existing epilepsy. Four epileptic dogs that received higher than the maximum recommended dose of 27.3 mg/lb (60 mg/kg) experienced at least one seizure within the week following the second dose of spinosad, but no seizures following the first and third doses. The cause of the seizures observed in the field studies could not be determined.

For technical assistance or to report a suspected adverse drug reaction, contact Elanco Animal Health at 1-888-545-5973. Additional information can be found at Alternatively, suspected adverse drug reactions may be reported to FDA at 1-800-FDA-VETS or

Mode of Action:

The primary target of action of spinosad, a component of TRIFEXIS pet med, is an activation of nicotinic acetylcholine receptors (nAChRs) in insects. Spinosad does not interact with known insecticidal binding sites of other nicotinic or GABAergic insecticides such as neonicotinoids, fiproles, milbemycins, avermectins and cyclodienes. Insects treated with spinosad show involuntary muscle contractions and tremors resulting from activation of motor neurons. Prolonged spinosad-induced hyper excitation results in prostration, paralysis and flea death. The selective toxicity of spinosad between insects and vertebrates may be conferred by the differential sensitivity of the insect versus vertebrate nAChRs.

Milbemycin oxime, a component of TRIFEXIS flea medicine, acts by binding to glutamate-gated chloride ion channels in invertebrate nerve and muscle cells. Increased permeability by the cell membrane to chloride ions causes hyper polarization of affected cells and subsequent paralysis and death of the intended parasites. Milbemycin oxime may also act by disrupting the transmission of invertebrate neurotransmitters, notably gamma amino butyric acid (GABA).


Heartworm Prevention:

In a well-controlled laboratory study, TRIFEXIS flea medicine was 100% effective against induced heartworm infections when administered for 3 consecutive monthly doses. Two consecutive monthly doses did not provide 100% effectiveness against heartworm infection. In another well-controlled laboratory study, a single dose of TRIFEXIS was 100% effective against induced heartworm infections.

In a well-controlled six-month US field study conducted with TRIFEXIS flea medicine, no dogs were positive for heartworm infection as determined by heartworm antigen testing performed at the end of the study and again three months later.

Flea Treatment and Prevention:

In a well-controlled laboratory study, TRIFEXIS for dogs demonstrated 100% effectiveness on the first day following treatment and 100% effectiveness on Day 30. In a well-controlled laboratory study, spinosad, a component of TRIFEXIS, began to kill fleas 30 minutes after administration and demonstrated 100% effectiveness within 4 hours. Spinosad, a component of TRIFEXIS, kills fleas before they can lay eggs. If a severe environmental infestation exists, fleas may persist for a period of time after dose administration due to the emergence of adult fleas from pupae already in the environment. In field studies conducted in households with existing flea infestations in dogs of varying severity, flea reductions of 98.0% to 99.8% were observed over the course of 3 monthly treatments with spinosad alone. Dogs with signs of flea allergy dermatitis showed improvement in erythema, papules, scaling, alopecia, dermatitis/pyodermatitis and pruritus as a direct result of eliminating the fleas.

Treatment and Control of Intestinal Nematode Infections:

In well-controlled laboratory studies, TRIFEXIS flea medicine was ≥90% effective in removing naturally and experimentally induced adult roundworm, whipworm and hookworm infections.


TRIFEXIS is a flavored chewable tablet for dogs. In a field study of client-owned dogs where 175 dogs were each offered TRIFEXIS once a month for 6 months, dogs voluntarily consumed 54% of the doses when offered plain as if a treat, and 33% of the doses when offered in or on food. The remaining 13% of doses were administered like other tablet medications.

Animal Safety:

TRIFEXIS flea medicine was tested in pure and mixed breeds of healthy dogs in well-controlled clinical and laboratory studies. No dogs were withdrawn from the field studies due to treatment-related adverse reactions.

In a margin of safety study, TRIFEXIS for dogs was administered orally to 8-week-old Beagle puppies at doses of 1, 3, and 5 times the upper half of the therapeutic dose band, every 28 days for 6 dosing periods. Vomiting was seen in all groups including control animals with similar frequency. Adverse reactions seen during the course of the study were salivation, tremors, decreased activity, coughing and vocalization.

Body weights were similar between control and treated groups throughout the study. Treatment with TRIFEXIS flea medicine was not associated with any clinically significant hematology, clinical chemistry or gross necropsy changes.

One 5X dog had minimal glomerular lipidosis observed microscopically. The clinical relevance of this finding is unknown.

Plasma spinosyn A, spinosyn D, milbemycin A35-oxime and milbemycin A45-oxime concentrations increased throughout the study. At each dosing period, plasma spinosyn A and spinosyn D concentrations were greater than proportional across the dose range 1 to 5X. Plasma milbemycin A45-oxime concentrations appeared to be dose proportional across range 1 to 5X by the end of the study. Plasma concentrations of spinosad and milbemycin oxime indicate that expected systemic exposures were achieved throughout the study.

In an avermectin-sensitive Collie dog study, TRIFEXIS, chewable tablets for dogs was administered orally at 1, 3 and 5 times the upper half of the recommended therapeutic dose band every 28 days. No signs of avermectin sensitivity were observed after administration of TRIFEXIS for dogs during the study period to avermectin-sensitive Collie dogs. The adverse reactions observed in the treatment groups were vomiting and diarrhea. Body weights in all treatment groups were comparable to the control group. Hematology and clinical chemistry parameters showed no clinically significant changes from study start to end, and all dogs were considered healthy throughout the study.

In a heartworm positive safety study, TRIFEXIS flea medicine was administered orally at 1, 3, and 5 times the upper half of the therapeutic dose band to Beagle dogs with adult heartworm infections and circulating microfilariae, every 28 days for 3 treatments. Vomiting was observed in one dog in the 1X group, in three dogs in the 3X group, and in one dog in the 5X group. All but one incident of vomiting was observed on the treatment day during the first treatment cycle. The vomiting was mild and self-limiting. Hypersensitivity reactions were not observed in any of the treatment groups. Microfilariae counts decreased with treatment with this dog flea medicine.

In a reproductive safety study, TRIFEXIS for dogs was administered orally to female dogs at 1 and 3 times the upper half of the therapeutic dose band every 28 days prior to mating, during gestation and during a six-week lactation period. Dogs with confirmed fetal heartbeats on ultrasound examination were evaluated for reproductive safety.

One 3X and one 1X group female did not become pregnant. No treatment-related adverse reactions or signs of avermectin toxicosis were noted for adult females treated with this dog flea medicine. Adult females in the 3X group lost weight during the 6-week pre-mating period, while control group females gained weight during that time. The body weights of the treated groups were comparable to the control group during gestation and post-parturition phases of the study.

Gestation length, litter average body weight, litter size, stillborn pups, pup survival and the proportion of pups with malformations were comparable between treated and control dam groups. Malformations in the 1X group included a pup with cleft palate and a litter mate with anophthalmia, fused single nares, misshapen palate, hydrocephalus, omphalocele and malpositioned testes; a pup with a malformation of the anterior tip of the urinary bladder and umbilical blood vessel; and a pup with patent ductus arteriosus (PDA). Malformations in the 3X group included three littermates with PDA. Malformations in the control group included a pup with a malformed sternum and a pup with PDA and a malpositioned superior vena cava. Clinical findings in pups of the treated groups with this pet med were comparable to the control group except for one 1X group pup that was smaller and less coordinated than its littermates and had tremors when excited. The relationship between spinosad and milbemycin oxime treatment and the 1X and 3X dogs that did not become pregnant, the specific pup malformations and the unthrifty 1X group pup are unknown. The incidence of cleft palate is not unexpected based on the historical data collected at the breeding site.

In a margin of safety study with spinosad alone, 6-week old Beagle puppies were administered average doses of this dog flea control medicine of 1.5, 4.4 and 7.4 times the maximum recommended dose at 28-day intervals over a 6-month period. Vomiting was observed across all treatments, including controls, and was observed at an increased rate at elevated doses.

Vomiting most often occurred 1 hour following administration and decreased over time and stabilized when puppies reached 14 weeks of age.

Storage Information:

Store this dog flea medicine at 20-25°C (68-77°F), excursions permitted between 15-30°C (59-86°F).

How Supplied:

TRIFEXIS Flea Medicine is available in five tablet sizes. Each tablet size is available in color-coded packages of 6 tablets.

  • 5-10 lbs (140 mg spinosad and 2.3 mg milbemycin oxime)
  • 10.1-20 lbs (270 mg spinosad and 4.5 mg milbemycin oxime)
  • 20.1-40 lbs (560 mg spinosad and 9.3 mg milbemycin oxime)
  • 40.1-60 lbs (810 mg spinosad and 13.5 mg milbemycin oxime)
  • 60.1-120 lbs (1620 mg spinosad and 27 mg milbemycin oxime)

This pet prescription medication is manufactured for Elanco Animal Health, A Division of Eli Lilly & Company, Indianapolis, IN 46285.

Elanco ™, Trifexis ™ are registered trademarks of Eli Lilly And Company.

Additional Information

Bottle Size

10-20lbs – 6 pack, 20-40lbs – 6 pack, 40-60lbs – 6 pack, 5-10lbs – 6 pack, 60-120lbs – 6 pack


Blue, Green, Brown, Orange, Pink

Product Type

Nutrition Medicine, OTC Medicine, Rx Medicine


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