Thank you Dr. Kellon for confirming this as in thread it was becoming less clear about the lose of efficacy once opened/dissolved/exposed etc.

Suzanne I have done as mentioned folding back into foil, put in a cool very dark container and balance is being used within 24 hours.  I can no longer trick horse with food treats and must dissolve full 2.5 pill dose and administer within 30 minutes (driving time to barn) in 10 ml of water.  I follow with some unsweetened applesauce to get a bit of tongue movement going, hoping the meds go down the hatch.
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Kandace K
Rocky Mountains, Alberta, Oct 2020
https://ecir.groups.io/g/CaseHistory/files/Kandace%20J%20and%20K
https://ecir.groups.io/g/CaseHistory/album?id=259062