I tried it. Supposedly it will work if you diagnose the parasite right away. It didn't work for me. I treated. the fish were better for a while and then the symptoms returned. I ended up having to kill all my fish, not just the Discus but every fish in the fish room. I sterilized all my tanks and sponges with and WC equipment with Clorox It was a very hard time for me. It was worse than when I got the Discus plague years later.
May I asked who you got your fish from? I'll tell you if you tell me.