a patient is prescribed levemir 13u subQ TID . a 10ml contains 100units/ml

how long will one vial of insulin last.
is it 25 days.need help with the formula

To determine how long one vial of insulin will last, we need to calculate how much insulin the patient will use per day and then divide this by the total amount of insulin in one vial.

First, let's calculate how much insulin the patient will use per day:

13 units per dose x 3 doses per day = 39 units per day

Now, let's calculate how many days one vial will last:

100 units per ml x 10 ml = 1000 total units in one vial

1000 total units / 39 units per day = 25.64 days

So, one vial of insulin will last approximately 25 days (rounded to the nearest day).