###HUMAN: until 8 months ago, when was the first time that patient 002-56583 was prescribed medication via dialysis?, ###ASSISTANT: SELECT medication.drugstarttime FROM medication WHERE medication.patientunitstayid IN (SELECT patient.patientunitstayid FROM patient WHERE patient.patienthealthsystemstayid IN (SELECT patient.patienthealthsystemstayid FROM patient WHERE patient.uniquepid = '002-56583')) AND medication.routeadmin = 'dialysis' AND DATETIME(medication.drugstarttime) <= DATETIME(CURRENT_TIME(), '-8 month') ORDER BY medication.drugstarttime LIMIT 1