Mounjaro uses a single use fully autometed injector--clean your skin, remove the cap, press the injector against your skin, then press a button. A springloaded needle penetrates you skin and a spring loaded plunger injects the medicine. You have no way to pull backthe plunger to see if you are in a vein/artery.
I've never used Ozempic, but my understanding was it used a device similar to insulin pens--dial you dosage, attach needle, insert needle, press at the base of the pen to inject the selected amount. Also no way to pull back to see if you hit a vein/artery.
