What you are describing is flat-out
illegal (practicing medicine without a license, which is a crime), and when the day comes that a doc won't "cover" them for whatever they did, they will be in v. serious trouble.
Why take the chance? Is it to save the doctors the incovenience of a telephone call, or is it the nurses' egos? If it's to avoid "bothering" the docs, that's what they bloody well get
paid so much for, and, if it's a power trip for the nurses, that's even scarier ...
You may want to make the hospital nursing administration and/or risk management people aware of this (anonymously, if you really can't deal). If the doo-doo hits the fan, the entire hospital could end up in trouble in addition to the few "bad apple" RNs, and that would really be a shame. (Of course, if administration knows about this and hasn't done anything to fix it, then whatever happened would serve them right ...)
Many years ago, I worked on a psych unit where the day shift charge nurse prided herself on knowing everything about everything (and yet, as is so often the case, exactly the opposite was true ...), and she would feel v. free to write "verbal orders" from the doc that the doc knew nothing about, because she was so confident that she knew best. I was the evening shift charge nurse, and came in one evening to find that she'd written an order for (and given) a full bottle of mag citrate to a tiny, frail, elderly gentleman, and was LAUGHING about it to us in shift report (that we would be busy with him that evening, ha ha ...

) By dinner time, he was having
projectile diarrhea; we'd no sooner get him and the bed cleaned up than he'd fill up the bed again; as this went on, he was getting so dehydrated and his electrolytes were getting so out of whack that he was having dramatic sensorium changes (standing up on the bed and dancing around in the diarrhea, getting aggressive with us when we were trying to clean him up, etc.) It was a horrible mess! His skin turgor, etc., was getting so bad, I was afraid we'd have to transfer him to the medical floor for stabilization. I called the doc a few times to update him, and we gave the poor little man huge honking doses of Lomotil or something to get him to stop. I also finally had a little talk with the doc over the 'phone, and pointed out that the chart said
he had ordered this man a big dose of strong laxative at 3 PM, and now, a few hours later,
he had ordered a huge dose of (whatever we gave him to stop him up), plus all these stat labs, etc., to deal with this crisis situation, and, looking at the chart, it looked like
he (the doc) didn't know what the he77 he was doing ... And that (the day shift charge nurse) did this sort of thing all the time and he let her get away with it, but this time it really mattered (this little man could be in v. serious trouble) and she was putting HIS license on the line, too -- was that okay with him??? 'Cause it wouldn't be okay with me; if it were ME, I'd be having a little word of prayer with her about putting my name on orders I hadn't actually given her ... (He did put his foot down with her the next day, and told her in plain English he was done covering for her and she needed to stop.)
Taking verbal/telephone orders is one thing, but just writing down what you think the doc would probably want to do is entirely different. Frankly, I'm surprised that the docs
do cover for these nurses you work with, and I hope they (the nurses) are fully aware that, if the day ever comes that something goes wrong, the docs definitely will
not cover for them (and will be well within their rights to do so -- why should one of them take a fall for something the nurse did?) -- the nurses will be left to dangle in the breeze, and losing their licenses could be just the beginning ...
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