There seem to be two different approaches taken by doctors, and I am wondering if there are any formal guidelines or "best practices?"
In the approach I have experienced, the doctor shows the patient how to perform the injection. The patient then injects a small dose in the office, and waits to determine the effect. The doctor then sends the patient home with instructions to gradually increase the dosage, in small amounts, until he is able to achieve a satisfactory erection.
The other approach is for the patient to make a series of appointments. At each appointment, the patient injects a pre-determined amount, under the doctor's supervision, until the right dosage is determined.