If you mean Lisinopril, that's for your blood pressure which is important to have its full effectiveness. Most medications (according to an Army study) had their effectiveness after 10 years. I do still take my pain pills, Xanax and Ambien which are 4-5 years old and they do work. If I don't get the full effectiveness, so what on those. But I would never take a blood pressure medication that is more than a year old.
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