Complete flee, tick and mosquito control. Repels ticks so they don???t have a chance to bite Effective on mosquitos to aid in heartworm prevention Triple Flea Protection: Kills Adults, Larvae And Eggs. ShieldTec Plus Kills And Repels Pests: Fleas, Ticks, Mosquitoes, Lice. 4 dose package, each dose last 4 weeks for a total of 4 months protection.