A really good piece of advice I got from an attending during my first week of intern year is that it saves you a lot of time if you write your orders correctly the first time. That way the nurses don't have to call you on it.
I know it seems obvious, but early in intern year, you're constantly making stupid mistakes when writing orders, like leaving out the "PO" or forgetting to sign them or leaving out the date and time. Spending an extra five seconds making sure you did everything right can ultimately save a lot of time.
Unfortunately, sometimes during residency, you have no choice but to write an order you know with 100% certainty you'll get called on.
Attending: "Can you write for the patient to get 12.5mg of trazodone?"
Me: "It comes in 50mg tablets."
Attending: "Oh. Well, maybe you can cut it in quarters?"
Me: "I doubt it."
Attending: "How big are the tablets?"
Nurse: "They're really small."
Attending: "Well, write for it anyway. If the pharmacy calls you about it, you can change it."
Me: [grumbles curses under breath]
Naturally, I wrote the order and the pharmacy paged me half an hour later to tell me that the pills couldn't be divided that way, so I had to rewrite it. All in all, it was like 10 minutes of wasted time.