Does anyone know of a best practice guideline for a timeline requirement for clinicians to return unused / unopened medications to the automated dispensing machine (Pyxis, Omnicell, etc.) after they've taken the med out of the machine for a patient and then not used them (ie. patient refused, etc.)?

Or, if you don't know of a published guideline, what timeline does your facility require?

Note: I'm not talking about wasting medication, but rather returning unused / unopened medication.

Thanks -
Chad