... prefilled pen. Dr prescribed 15 boxes and pharmacist gave me 5 saying the 5 pens should last 57 days taking 26 units. I do not calculate it the same
This question has also been asked and answered here: How long does Lantus last?
I calculate the same as the pharmacy. 100 units per ml x 3 = 300 units or just under 12 days worth per pen.
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