I have a Lantus pen. [note: yes I know people here don't like the pen needle. bear with me] I used a syringe on it a few times to give a dose with a half-unit. Now I'm back on a full unit, and wanted to use the pen needle again. I have been careful not to get air bubbles in the reservoir. I stuck a needle on the pen, turned the wheel to prime it, and... nothing came out. Tried again, still nothing. A bit later, I had a brainwave: since the way the pen expels its doses when using the needle is by applying pressure to the liquid, if I have removed anywhere between 8-10 units with my needle shots, maybe I need to "dial back up" to those numbers? So I turned the wheel a bit more, a few times, and lo and behold, insulin started coming out of the needle. I did a check with 1ui and 2ui as I've already drawn "blanks" for those values and have an eyeball sense of how many drops should come out. Seems good. Questions: 1) does my analysis make sense? 2) anybody else been through this -- drawing insulin with syringe, then wanting to go back to the needle, and having to "catch up" with the dial?