I am trialing Apidra right now, I have very low expectations but I have a large stockpile of Apidra and I'd hate to see it go to waste so I need to at least try it. Cartridges can be reused in an emergency. Go through the usual process, you do not have to actually remove the old cartridge, similar to restarting a sensor. Disconnect before doing it. The insulin remaining gage may not work properly, so be wary when getting low on a reused cartridge. If you do this, the usual fill rules still apply: you must prime at least 10 units and there must be at least 50 units remaining after priming. But if you're in a pinch, there is no interlock preventing it. Also for emergency use, you can withdraw from the cartridge to a syringe. I tested it when my display said 5u remaining, and was able to draw out 24 units to a syringe. I am not advocating using these techniques, but they have both been used to save my butt many times in my pumping career so I am relieved to know that the cartridge design does not prevent this.