Sorry but this smacks of someone who hasn’t a clue what is involved in prescribing, verifying the correct dose, ensuring there are no interactions that might be dangerous, and doing all the checks necessary. The physical prescribing might take a few minutes, but ensuring it’s safe to prescribe can take much longer.
I am a doctor, I have done weekend ward cover, and I can fully 100% believe that they wouldn’t have had the time. Ward cover is horrendous, you’re constantly pulled in different directions, bleep constantly going off, everyone is sure that their issue is the most urgent. You’re balancing all these spinning plates and praying you’re making the right choices and prioritising the right things because if you’re not, people will come to harm. The shift ends and you can’t just hand stuff over, because generally the night shift will have even more to deal with. So anything you haven’t got done in the day probably just won’t get done. So you stay as late as you can, probably starving hungry because you’ve not stopped to eat anything all day, until you have to go home because you’re back again the next morning to do it all again.
The attitude from some of the ward staff can be awful, they think if you’re not there on their ward doing things they can see and understand, that you’re just sitting somewhere having a cup of tea and chilling. They genuinely don’t believe how busy the medical team are and think that any delays are you just “not pulling your finger out”. That, combined with the fact they can sometimes seriously underestimate the thing they are asking you to do (as demonstrated above) can make for very tricky working conditions.
I don’t know what medication OP’s DC needed, or why it wasn’t done, I can just fully believe the medical team were so overwhelmed they didn’t have a chance to do it. It isn’t good enough, but it won’t get better until the NHS is better staffed, or the huge drains on doctors’ time (piles of admin, slow computer systems that take ages to do anything, duplicate work, the time it takes just to find and verify information etc etc) are sorted.