When I originally replied to this thread I was using Frontline drops. Now I'm using NexGard which is a pill. It works GREAT! It prevents fleas and ticks.
We had an outbreak of fleas here and this was the only thing that seemed to work. I even got the cats on Comfortis. I think the oral meds work better than topical. At least for me.
And I need tick protection for when the dogs go out to my moms/brothers houses.