My 3 dogs have been on Interceptor for heart worms and Comfortis for fleas with no issues. I sent in my prescription to get refils and was told that they are now combining them in Trifexis and it is the same ingredients but in 1 pill. So, that is what I am expecting to get in the mail. I went online and of course there are all sorts of good and bad review, but I am interested if anyone here has tried this and what their results are. I am a bit nervous after reading the bad reviews.