Im not from the UK but Lorazepam seems to be the go to drug of choice when it comes to agitation & anxiety. The side effects considerable but generally quick acting.
When Mum was trialled on this for a week, initially worked but then just too sedating as mentioned earlier.
They then trialled Quetiapine ( Seroquel) as Mum was hallucinating and at times aggressive also. They did have Lorazepam as needed but I asked them not to ( I am Mums POA)
After a few tweaks it has worked well since Nov until now.
Mum was not super drowsy and still coherent.
These past few weeks Mum was admitted to hospital from her care home with acute delirium following a suspected UTI.
I say suspected as they could not get a sample frim her so they put her on anti bs as a precaution.
As Mum was majorly aggressive & physical to the point they had to call security, she was given shot of Halperidol & Lorazepam.
In this situation it was agreed by me.
Again worked short term but the side effects not pleasant.
Mum is back at her care home and her meds overall are being reviewed as to what is absolutely necessary. No doubt she will remain on Quetiapine for a while but its reviewed regularly.
In your Mums case, if the agitation and anxiety is caused by pain shouldnt pain releif be their first line?? Sounds like they want to give Lorazepam to make it easier for them