I take insulin shots to control my Type 1 diabetes. I have asked my dr for a prescription for the flexpen. She provided it and gave me 2 sample pens. I read the pamplet inside and it states that after opening the pen should be discarded after 14 days. However the pen contains 100 units of insulin. That amount, when given in a vial, lasts me a month. The pamplet says that it can not be refridgerated after opening. My question is if I purchase the flexpen am I essentially throwing money away on the unused insulin? Are any of this type flexpen prefilled with less than 100 units of insulin? I am not willing to waste any insulin so I will not fill the prescription if I have to discard half the insulin.