I've had it done, and while mine was pretty painless, I'm sure it depends on where the abscess is located and the skill of the doctor placing the drain. I would ask to be present while it's done that way you can ask for more sedation if there's any problem. It should be fine though, as long as he has a local, he shouldn't feel anything internally. Good luck and let us know how it goes.
Just a question, if they aren't a 100% sure he has the abscess, how are they going to place the drain? What are they using to visualize the abscess and the procedure? Mine was so long ago, I can't remember what they used, maybe ultrasound?
49 years old, CD since I was a child.
Six resection surgeries, permanent ostomy, adverse reactions to Remicade, finally off of Prednisone, hoping for a long remission from this last surgery.