Are you sure your son hasn’t received info? I’m having surgery Tuesday on my thumb…and I received a folder with a packet of pre and post op directions from my doctor. They actually scheduled an appointment last week with a PA to give me this, and so I could ask questions.
When I had knee surgery (different doctor), likewise, I had pre and post op info given to me prior to the procedure. And it was then explained again to my husband who accompanied me to the surgery.
In both cases, the pre surgery info session included making sure they had my pharmacy for both ore and post op medications.