I have been working with a multiple-provider practice, and they have encountered instances of pharmacy stating that they don't have the script even after it has been sent and shows a status of verified.
They are also implementing their patient portal, and so the current plan (esp in the case of trouble pharmacies) is to drop the patient a secure message telling them the prescription was sent, and verified at such-and-such a date and time.
That gives the patient specifics if the pharmacy is difficult, and it sets expectations with the patient as when the practice did the prescription. We'll see how that works out.
