Opened Lantus and Levemir vials, cartridges, and pens can last longer than many FDMB members seem to think. Some caregivers of diabetic cats have used Lantus/Levemir down to the last drop. Lantus users from the German Katzen Forum have reported using opened Lantus for up to six months and Levemir up to four months if kept refrigerated and handled properly. Lantus is NOT as fragile as we once thought.
From two of the leading researchers in the field of lantus use with feline diabetics, Jacquie S. Rand BVS, DVS and Rhett D.Marshall BVS (University of Queensland, Brisbane, Australia):
"Glargine should be refrigerated because it has a shelf life of 4 weeks once opened and kept at room temperature. We have found that opened vials kept refrigerated can be used for more than 6 months. If using an insulin pen, the manufacturer recommends that once a vial of insulin is used, the pen be kept at room temperature because temperature changes associated with refrigeration alter the volume administered by the pen."
http://www.uq.edu.au/ccah/index.html?page=43599&pid=0
We use U100 syringes to draw Lantus from cartridges and pens. We do NOT use needle tips which can be attached to the pens to administer insulin. Therefore, refrigeration will not alter the volume administered by the pen apparatus. Refrigeration combined with the use of syringes to draw insulin (versus using the needle tip made for the pen) from the opened pen has been found to extend it's life well beyond the 28 days suggested by the manufacturer.
Unopened Lantus is good until the expiration date stamped on the box if refrigerated and handled properly.
