I'm on my last rotation. My clinical work has mainly been renal dosing of meds, dosing vanco & gentamicin, investigating possible ADRs, etc.
Every hospital I've been at allows the pharmacist to dose vanco, gent, etc. One hospital let the pharmacist change the doses of other meds based on renal function. At the other hospitals, you wrote a pharmacist care note and left it in the chart for the physician. Almost all of the MDs follow the pharmacist's advice. But some of them have egos from hell and just throw them away.
For instance, yesterday I found a patient with a serum creatine of 1.6 and a creatinine clearance of 46. They were taking metformin 850mg three times a day. Because the drug is contraindicated in this population it needed to be discontinued, but the MD just cut it down to twice a day. The pharmacist phoned the MD and left a message, but there was no call back. Hopefully, the MD will think about it and do what's best for the patient.