Just got home from a trip--I asked my wife about it ( a DVM) and Thundertwonk is correct- Novartis stopped making the Interceptor(Milbemycin / Praziquantal). Another verson is Sentinel- this one is (Luferon/Milbemycin).... Now the LUFERON kills more species of worms.- thus a better de-wormer.
She told me the two parts to Interceptor are: 1. Milbemycin and 2. Praziquantal. The "prazi" is the de-wormer, and the milbemycin kills invertebrates.(scary for us?)
But me being new, and planning a FOWLR, I have to ask would you rather have JUST the Praziquantal by itself? It is possible to get that one isolated, and possibly Lufenuron.