Henny peeny, if you're happy with the trifexis you should probably consider sticking with that even once Novartis starts making Interceptor again (if they bring it back, part of the reason they are not producing it right now even though their plant is back up and getting started on other various products...including sentinel which is the interceptor plus program...is that they are working on a new product that they are probably planning to launch in January at the North American Vet conference). Trifexis is the exact same active ingredient as interceptor with comfortis added for flea control. The vet I work for is considering whether or not to carry interceptor again once the company finally starts producing it again, but she has decided not to carry the sentinel any longer and is replacing it with trifexis.