Afoxolaner Afoxolaner is an insecticide and acaricide that belongs to the isoxazoline chemical compound group. It acts as an antagonist at ligand-gated chloride channels , in particular those gated by the neurotransmitter gamma-aminobutyric acid . Isoxazolines, among the chloride channel modulators, bind to a distinct and unique target site within the insect GABA-gated chloride channels , thereby blocking pre-and post-synaptic transfer of chloride ions across cell membranes . Prolonged afoxolaner-induced hyperexcitation results in uncontrolled activity of the central nervous system and death of insects and acarines.Marketing Afoxolaner is the active principle of the veterinary medicinal products NexGard and Nexgard Spectra . They are indicated for the treatment and prevention of flea infestations, and the treatment and control of tick infestations in dogs and puppies for one month. These products are administered orally and poisons fleas once they start feeding. The marketing authorization was granted by the European Medicines Agency in February 2014 for NexGard and January 2015 for Nexgard Spectra , after only 14 and 12 months of quality, safety and efficacy assessment performed by the Committee for Medicinal Products for Veterinary Use . Therefore, long-term effects are not known.List of excipients ">Excipient">excipients In NexGard and NexGard Spectra: Additionally in NexGard Spectra:Dosage Afoxolaner is recommended to be administered at a dose of 2.7-7 mg/kg dog's bodyweight.Toxicity for mammals According to clinical studies performed prior marketing: The oral toxicity profile of afoxolaner consists of a diuretic effect, effects secondary to a reduction in food consumption and occasional vomiting and/or diarrhoea following high oral doses. No treatment-related effects on vomiting or diarrhoea were noted following oral doses of up to 31.5 mg/kg bw in the pivotal target animal safety study , nor in the EU field trial . mild gastrointestinal effects, pruritus , lethargy , anorexia , and neurological signs have been reported in less than 0.1% of 10,000 animals treated, including isolated reports, most reported adverse reactions being self-limiting and of short duration, : vomiting, diarrhoea, lethargy, anorexia, and pruritus were observed in 0.2 to 1% of 10,000 animals treated and were generally self-limiting and of short duration, In vitro studies reported that afoxolaner can bind to dopamine and norepinephrine cellular transport receptor systems and the CB1 receptor ; inhibition of these catecholaminergic systems and certain types of competitive binding at CB1 receptors may mediate pharmacodynamic effects of diuresis , decreased food consumption, and decreased body weight in animals. According to post-marketing safety experience: : erythema and neurological signs have been reported in less than 0.1% of 10,000 animals treated, including isolated reports, The US FDA reports that some drugs in this class, including afoxalaner , can have adverse neurologic effects on some dogs, such as muscle tremors , ataxia , and seizures . Extralabel use of afoxolaner in a pet pig has been described without any adverse effects . Experimental use in commercial pigs also did not result in any adverse effects.Selectivity insects over mammalians In vivo studies provided by MERIAL , the company that produces afoxolaner-derivative medicines, did not show evidence of neurological or behavioural effects suggestive of GABA-mediated perturbations in mammals. The Committee for Medicinal Products for Veterinary Use therefore concluded that binding to dog , rat or human GABA receptors is expected to be low for afoxolaner . Selectivity for insect over mammalian GABA-receptors has been demonstrated for other isoxazolines. The selectivity might be explained by the number of pharmacological differences that exist between GABA-gated chloride channels of insects and vertebrates.
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