lantus insulin pen once open how long can use
LANTUSÂ® SoloSTARÂ® is a disposable prefilled insulin pen. Please talk to your healthcare provider about proper injection technique and follow instructions in the Instruction Leaflet that accompanies the pen. *Pen contains 300 total units of insulin. It can be used for up to 28 days once opened. Store the opened LANTUSÂ® SoloSTARÂ® pen at room temperature but not above 86Â°F. 2  Keep the pen away from sunlight as much as possible. 3  Don't leave it anywhere it can overheat, such as on a sunny windowsill or in a parked car. 4  Use your pen for up to 28 days. 5  After 28 days, throw it away, even if it still has insulin in it.