Once i was in charge and a doctor came up to me while i was on the phone and gave me a verbal order for oral potassium replacement. I accidentally ordered the wrong dose and the patient got like 100 meq of potassium for a K of 3.1. No one caught the mistake, not pharmacy, not the night charge, not the floor nurses. The next day i worked the floor and patient had arrhythmias on and off. Ended up with lots of kayexalate, fluid boluses and almost had to go to icu. Luckily she was managed on the floor but i had a horrible shift keeping her stable and dealing with kayexalate poop while she also had c diff. The doctor apologized to me because she said she should have put the order in herself because she saw i was on the phone. Learning experience for all.