NexGard 136 mg Chewable Tablets for Dogs >25-50 kg

Composition

Each chewable tablet contains:

Active substance:

Excipients:

Qualitative composition of excipients and other constituents

Maize starch

Soy protein fines

Beef braised flavouring

Povidone (E1201)

Macrogol 400

Macrogol 4000

Macrogol 15 hydroxystearate

Glycerol (E422)

Triglycerides, medium-chain

Mottled red to reddish brown, rectangular shaped chewable tablets (for dogs > 25–50 kg).

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Pharmacological properties

4.1 ATCvet code: QP53BE01.

4.2 Pharmacodynamics

Afoxolaner is an insecticide and acaricide belonging to the isoxazoline family. Afoxolaner acts at ligand-gated chloride channels, in particular those gated by the neurotransmitter gamma-aminobutyric acid (GABA), thereby blocking pre- and post- synaptic transfer of chloride ions across cell membranes. This results in uncontrolled activity of the central nervous system and death of insects or acarines. The selective toxicity of afoxolaner between insect/acarines and mammals may be inferred by the differential sensitivity of the insect/acarines’ GABA receptors versus mammalian receptors.

Afoxolaner is active against adult fleas as well as several tick species such as Dermacentor reticulatus and D. variabilis, Ixodes ricinus, Ixodes hexagonus and I. scapularis, Rhipicephalus sanguineus, Amblyomma americanum, Haemaphysalis longicornis, and Hyalomma marginatum.

The veterinary medicinal product kills fleas within 8 hours and ticks within 48 hours.

The veterinary medicinal product kills fleas before egg production and therefore prevents household contamination.

4.3 Pharmacokinetics

After oral administration in dogs, afoxolaner was shown to have high systemic absorption following administration. The absolute bioavailability was 74 %. The mean maximum concentration (Cmax) was 1,655 ± 332 ng/ml in plasma at 2–4 hours (Tmax) after a 2.5 mg/kg afoxolaner dose.

Afoxolaner distributes into tissues with a volume of distribution of 2.6 ± 0.6 l/kg and a systemic clearance value of 5.0 ± 1.2 ml/hr/kg. The terminal plasma half-life is approximately 2 weeks in most dogs; however, half-life of afoxolaner can differ between dogs (e.g. in one study, t½ in Collies at 25 mg/kg bodyweight was up to 47.7 days) with no effect on safety. In vitro experiments demonstrated that P-glycoprotein efflux does not occur, confirming that afoxolaner is not a substrate for the P- glycoprotein transporters.

Afoxolaner in the dog is metabolised to more hydrophilic compounds and then eliminated. The metabolites and parent compound are eliminated from the body via urinary and biliary excretion with the majority eliminated in the bile. No evidence of enterohepatic recycling has been observed.

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Target species

Dogs.

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Indications

Treatment of flea infestation in dogs (Ctenocephalides felis and C. canis). The veterinary medicinal product provides immediate and persistent killing activity for at least 5 weeks.

For reduction of the risk of infection with Dipylidium caninum via transmission by Ctenocephalides felis for 30 days. The effect is indirect due to the activity of the veterinary medicinal product against the vector.

The product can be used as part of a treatment strategy for the control of flea allergy dermatitis (FAD).

Treatment of tick infestation in dogs (Dermacentor reticulatus, Ixodes ricinus, Ixodes hexagonus, Rhipicephalus sanguineus, Hyalomma marginatum). The veterinary medicinal product provides immediate and persistent killing activity for one month.

For reduction of the risk of infection with Babesia canis via transmission by Dermacentor reticulatus for 28 days. The effect is indirect due to the activity of the veterinary medicinal product against the vector.

Fleas and ticks must attach to the host and commence feeding in order to be exposed to the active substance.

Treatment of demodicosis (caused by Demodex canis).

Treatment of sarcoptic mange (caused by Sarcoptes scabiei var. canis).

Treatment of ear mite infestations (caused by Otodectes cynotis).

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Dosage

Oral use.

Dosage:

The veterinary medicinal product should be administered at a dose of 2.7 to 7 mg/kg bodyweight of afoxolaner in accordance with the following table:

Strength and number of chewable tablets to be administered

For dogs above 50 kg bodyweight, use an appropriate combination of chewable tablets of different/same strengths.

To ensure a correct dosage, body weight should be determined as accurately as possible.

The chewable tablets should not be divided. Underdosing could result in ineffective use and may favour resistance development.

Method of administration:

The tablets are chewable and palatable to most dogs. If the dog does not accept the tablets directly they may be administered with food.

Treatment schedule:

Treatment of flea and tick infestations:

Monthly intervals throughout the flea and/or tick seasons, based on local epidemiological situations and the animal’s lifestyle.

Treatment of demodicosis (caused by Demodex canis):

Administration of the veterinary medicinal product leads to a marked improvement of clinical signs. Treatment should be continued until two negative skin scrapings are obtained one month apart. Severe cases may require prolonged monthly treatments. As demodicosis is a multi-factorial disease, where possible, it is advisable to also treat any underlying disease appropriately.

Treatment of sarcoptic mange (caused by Sarcoptes scabiei var. canis):

Monthly administration of the veterinary medicinal product for two consecutive months. Further monthly administration may be required based on clinical assessment and skin scrapings.

Treatment of ear mite infestations (caused by Otodectes cynotis):

A single dose of the veterinary medicinal product should be administered. A further veterinary examination one month after the initial treatment is recommended as some animals may require a second treatment.

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Contraindications

Do not use in cases of hypersensitivity to the active substance or to any of the excipients.

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Adverse reactions

Dogs:

Very rare (<1 animal / 10,000 animals treated, including isolated reports):

Digestive tract disorders1 (vomiting2, diarrhoea2)

Lethargy2, anorexia2

Pruritus2

Neurological disorders (convulsion2, ataxia2, muscle tremor2).

1 Mild.

2 Mostly self-limiting and of short duration.

Reporting adverse events is important. It allows continuous safety monitoring of a veterinary medicinal product. Reports should be sent, preferably via a veterinarian, to either the marketing authorisation holder or its local representative or the national competent authority via the national reporting system. See the package leaflet for respective contact details.

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Warnings

Special precautions for safe use in the target species:

In the absence of available data, treatment of puppies less than 8 weeks of age and/or dogs less than 2 kg bodyweight should be based on a benefit-risk assessment by the responsible veterinarian.

Special precautions to be taken by the person administering the veterinary medicinal product to animals:

To prevent children from getting access to the veterinary medicinal product, remove only one chewable tablet at a time from the blister. Return the blister with the remaining chewable tablets into the carton. In case of accidental ingestion, seek medical advice and show the package leaflet or the label to the physician.

Wash hands after handling the veterinary medicinal product.

Special precautions for the protection of the environment

Not applicable.

3.11 Special restrictions for use and special conditions for use, including restrictions on the use of antimicrobial and antiparasitic veterinary medicinal products in order to limit the risk of development of resistance

Not applicable.

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Use during pregnancy, lactation or lay

Pregnancy and lactation:

Can be used in pregnant and lactating dogs.

Laboratory studies in rats and rabbits have not produced any evidence of teratogenic effects.

Fertility:

Can be used in breeding females.

The safety of the veterinary medicinal product has not been established in breeding males. In breeding males, use only according to the benefit-risk assessment by the responsible veterinarian.

Laboratory studies in rats and rabbits have not produced any evidence of teratogenic effects, or any adverse reactions on the reproductive capacity of males.

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Interactions

None known.

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Overdose

No adverse reactions were observed in healthy Beagle puppies over 8 weeks of age when treated with 5 times the maximum dose repeated 6 times at intervals of 2 to 4 weeks.

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Special warnings

Parasites need to start feeding on the host to become exposed to afoxolaner; therefore the risk of the transmission of parasite borne diseases cannot be excluded.

Unnecessary use of antiparasitics or use deviating from the instructions given in the SPC may increase the resistance selection pressure and lead to reduced efficacy. The decision to use the product should be based on confirmation of the parasitic species and burden, or of the risk of infestation based on its epidemiological features, for each individual animal.

The possibility that other animals in the same household can be a source of re- infestation with fleas, ticks or mites should be considered, and these should be treated as necessary with an appropriate product.

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Withdrawal period

Not applicable.

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Incompatibilities

Not applicable.

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Immediate packaging

The veterinary medicinal product is individually packaged in thermoformed laminated PVC blisters with paper-backed aluminium (PVC/Alu).

Cardboard box with 1 blister of 1, 3 or 6 chewable tablets or 3 blisters of 6 chewable tablets or 15 blisters of 1 chewable tablet.

Not all pack sizes may be marketed.

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Storage

This veterinary medicinal product does not require any special storage conditions.

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Shelf life

Shelf life of the veterinary medicinal product as packaged for sale: 3 years.

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Disposal of unused product

Medicines should not be disposed of via wastewater.

Use take-back schemes for the disposal of any unused veterinary medicinal product or waste materials derived thereof in accordance with local requirements and with any national collection systems applicable to the veterinary medicinal product concerned.

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Additional information

Vm 61700/5031

8 DATE OF FIRST AUTHORISATION

11 February 2014

9 DATE OF THE LAST REVISION OF THE SUMMARY OF THE PRODUCT CHARACTERISTICS

January 2026

10 CLASSIFICATION OF VETERINARY MEDICINAL PRODUCT

Veterinary medicinal product subject to prescription.

Find more product information by searching for the ‘Product Information Database’ or ‘PID’ on www.gov.uk.

Gavin Hall Approved: 08 January 2026

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Registration holder

Boehringer Ingelheim Vetmedica GmbH

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