Today I aimed at Nexium in a patient's list and clicked refill before I realized I had hit Magnesium (the next one up the list) by mistake. Once it's in the print queue, it's updated in the list as refilled.
I wish there was a "cancel" button next to the print and preview buttons.
You know when you are trying to be efficient and doing something routine like placing a refill, it's easy to make a few clicks in rapid succession with barely any thought, so that kind of mistake is pretty easy to make.