I used it for years. I would say about 5 years. Last year I had to switch as it was not working. Was told that coccidia was like worms and they get resistant. All I know is that I switched and I now don't have a problem.
I stored what I wasn't using in the freezer.
I loved using it.. I must say and if it works for your babies.. that's what I would use.
I started using it and my kids are doing great. They wouldn't touch their bottles when I added the other Coccidia medications to them. I ordered a bag of Deccox-M and started adding it to their bottles and they nurse them just like normal.