Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
I have gone through the medicines you have mentioned.
All these drugs are given before surgery as a part of 'patient preparation'.
These drugs will make you easy during surgery.
Laxatives are needed to clear whole bowel.
Gabapentin is needed to prevent nervous pain.
Apretitant and
Diazepam are given to make you calm and compose before surgery.
Before surgery, it is recommended that you're have sound sleep. So these drugs are necessary.
No need to worry. These are temporary drugs to make your surgery smooth.
No harm in taking them.
Hope I have answered your query.
Let me know if I can assist you further.