Fleas - According to research studies, adult fleas are killed for up to three months following an application of fipronil. If, however, your dog or puppy is susceptible to flea allergy dermatitis, or if you believe there is a risk of reinfestation, apply every month.
Ticks - Each application kills ticks for one month or longer. For best control of ticks, apply once every month.
Chewing Lice - Each application kills chewing lice for one month or longer. For best control of chewing lice, apply once every month.
How to Apply
Squeeze the entire contents of the applicator onto the dog’s skin at a single point between the shoulder blades.