Correct me if I'm wrong, but I believe the Lantus pens only deliver in whole units, yes? A couple of times this summer DS slept at either MIL/my sister's house. They have a hard time w/ the syringe and getting 13 1/2 units out of the Lantus bottle. Are Lantus pens pre-filled? Can I get a cartridge of Lantus to fit into a Novolog Jr. pen to get 1/2 units? I too sometimes struggle w/ my bad eyes at night getting the 13 1/2 units just right; DS certainly can't do it either but handles the pen quite well. A pen would be easier, but I'm not sure if there are options - any suggestions would be appreciated!