When in Doubt, "Pharm Out" Calls from Nurses
You'll occasionally need to decide where to draw the line so that you're performing at your maximum effectiveness, but not crossing over the line of providing patient counselling.
Provide the best service you can for patients, and stop short of providing "clinical judgment."
For example, it's okay to confirm that simvastatin is the generic for Zocor. But it's NOT okay to advise patients to steer clear of grapefruit juice while taking simvastatin...since this ventures into the territory of interpreting clinical drug interactions.