Hi Donna,  I have always been told by my horse's vets, even the current one, to dose him 20 - 22 pills 2x per day.  So that's probably where you got the higher number.  

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Joy and Willie (PPID/IR)
Nevada County, CA - 2019

Case history:  https://ecir.groups.io/g/CaseHistory/files/Joy%20and%20Willie
Willie's photo album:  https://ecir.groups.io/g/CaseHistory/album?id=242526