I had to surrender my medical 2 years ago. I had gone on meds I couldn't fly with. AMAS Doc said just lay low and don't fly, don't mention the new med until I have to. A month later I got a routine letter from the FAA medical folks wanting an updated list of my prescriptions. I'd been on waivers for many years. I called the AMAS Doc back and he said just send in the medical along with the updated list of drugs. I sent it to OKC via certified mail along with the list explaining I'd just recently started the grounding medication.