Treatment
for Cat Flea
UC IPM and Texas A&M AgriLife both stress treating the pet and its environment together — neither front can be skipped. Source: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7419.html Source: https://agrilifeextension.tamu.edu/library/insects/controlling-fleas/
On the animal, both sources point to proven actives: fipronil and imidacloprid kill adult fleas, while lufenuron instead blocks their reproduction. These are veterinary products, so route the choice and dosing through the pet's veterinarian. Source: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7419.html Source: https://agrilifeextension.tamu.edu/library/insects/controlling-fleas/
For the environment, both name methoprene and pyriproxyfen — insect growth regulators that halt development so eggs and larvae never mature into adults. Because the cocooned pupa is shielded and adults keep emerging, expect follow-up visits. Source: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7419.html Source: https://agrilifeextension.tamu.edu/library/insects/controlling-fleas/