From Cow

Fipronil is an insect growth regulator effective against a number of external parasites of cattle, including Cochliomyia spp[1] and Boophilus microplus[2].

Resistance in ticks have been reported[3].

Fipronil is used for the treatment and control of horned fly, ticks (Dermatobia spp), masticator and sucking lice, and miasis. Its action on populations of horned fly (up to 6 weeks) and ticks (up to 8 weeks) that are resisting to other parasiticides is specially relevant.

The recommended dose in cattle is 1 mL/10 kg body weight, applied along the dorsal line in the narrow band extending from the cervix to the base of the tail.


  1. Lima WS et al (2004) Evaluation of the prophylactic effect and curative efficacy of fipronil 1% pour on (Topline) on post-castration scrotal myiasis caused by Cochliomyia hominivorax in cattle. Vet Parasitol 125(3-4):373-377
  2. Catto JB et al (2009) Grazing systems, rotenone and parasites control in crossbred calves: effect on live weight gain and on parasites burdens. Rev Bras Parasitol Vet 18(4):37-43
  3. Guerrero FD et al (2012) Acaricide resistance mechanisms in Rhipicephalus (Boophilus) microplus. Rev Bras Parasitol Vet 21(1):1-6