Apidra insulin past 28 days

Good morning.
I arrive one day with glycemia a little high in some points of the day.I have realized that the boli with which sometimes clicks me, that I had it next to the new one, it is one open 1 and a month ago or so.Is it true that after 28 days do you lose effectiveness?If it is well preserved at room temperature to what extent will it lose insulin?Should I throw it and continue with the new one?I am sorry to discard insulin that apparent me is fine.I am a little complimated and I don't know if that's why or for the ball that has 28 days after.Greetings and thanks.

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Hello good,

They can be both so that you do not want to discard insulin, try if with that cold and the new ball the glycemia low well, and if ... it is the cold

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