Informed consent says that you are of age, understand and accept the risks associated with the treatment regiment you are requesting. The doc will do an eval and make sure he doesn't feel there might be an issue. If you have any history of mental illness he may run you thru normal counseling channels before prescribing. They will have you fill out a series of paperwork releasing them from any liability. It takes about a week, to 10 days and two doc visits. One for the evaluation, blood draw and physical. The next is for analysis, prescription and of course the review of the IC documents. You do need to advise the scheduler that you are looking for that option.
I did not go that direction. I only found out Dr Smith provided that after going thru the counseling. It was a good thing tho. The GT affirmed what I had been thinking and had no trepidations about providing me a letter knowing that I could have gone with IC.