He wrote PCP which in my mind means Primary Care Physician. Patients with schizophrenia struggle with insight, others have varying degrees and for many it is the denial around substance abuse more than poor insight. That's a whole different ball game. Obviously, as a psychologist, I don't spend a lot of time understanding the details of the specific mechanisms of the various medications, half-lifes, and receptors targeted, but trust me I understand why my patients discontinue medications and often it is because the doc doesn't take the time to educate.