NexGard Spectra rapidly kills adult fleas and is indicated for the treatment and prevention of flea (Ctenocephalides spp.) infestations, for the control of newly acquired adult fleas and for the control of flea allergy dermatitis. Following administration, fleas are killed within 6-8 hours. Rapid onset of action kills newly acquired fleas before they can lay eggs. Fleas can transmit flea tapeworm (Dipylidium caninum). Effective flea control with NexGard Spectra prevents flea tapeworm infestation in dogs. NexGard Spectra treats and controls Paralysis ticks (Ixodes holocyclus), Brown Dog ticks (Rhipicephalus sanguineus) and Bush ticks (Haemaphysalis longicornis) for one month. NexGard Spectra provides effective control of pre-existing Paralysis tick infestations within 24 hours. Ixodes holocyclus ticks do not occur in Western Australia. In tick season, daily searching for, and removal of, any ticks found is recommended. NexGard Spectra treats and controls demodectic mange caused by Demodex spp., sarcoptic mange caused by Sarcoptes scabiei and ear mite (Otodectes cynotis) infestations. NexGard Spectra prevents heartworm disease caused by Dirofilaria immitis and treats and controls roundworms (Toxocara canis and Toxascaris leonina), hookworms (Ancylostoma caninum and A. ceylanicum) and whipworms (Trichuris vulpis). Consult a veterinarian if worm problems persist.