ExoticRx · exoticrx.com/drugs/pyriproxyfen
Nylar, Vectra(component)
Juvenile hormone analog that mimics insect juvenile hormone, preventing flea eggs from hatching and larvae from developing into adults. Disrupts the flea life cycle without killing adult fleas.
Extremely low mammalian toxicity. Toxic to aquatic invertebrates — keep treated animals away from water bodies. Does not kill adult fleas; combine with adulticide for complete flea control.
Each ExoticRx dose rule is graded by the strength of its primary evidence — see the editorial process.
Free-tier preview — dog and cat dosing. Pro and Student unlock all 2 species including reptiles, birds, pocket pets, livestock, and equine.
| Species | Route | Dose | Frequency | Evidence | Source |
|---|---|---|---|---|---|
| Dog (Domestic) | Topical | 1–5 mg/kg | q30d | Strong | Product labels (Vectra, Activyl); FDA openFDA Adverse Event Database |
| Cat (Domestic) | Topical | 1–5 mg/kg | q30d | Strong | Product labels; FDA openFDA Adverse Event Database |
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View PlansSource citations and evidence levels available on the live page. Reference only — verify against current literature before clinical use.