Ordered: Insulin lispro 24 units subcut 4 times daily, with meals and at bedtime, for 90 days. On hand: 1,000 unit vials of insulin lispro Note: Partial vials are not dispensed. What is the amount to dispense?

Calculation: Calculate the total daily dose in units. Total daily dose = 24 units/dose × 4 doses/day = 96 units/day. Calculate the total units needed for the 90-day supply. Total units = 96 units/day × 90 days = 8640 units. Total units per vial = 1000 units. Calculate the number of vials needed. Vials needed = Total units / Units per vial = 8640 units / 1000 units/vial = 8.64 vials. Account for partial vials not being dispensed. Vials to dispense = 9 vials.