instruction: tell me the drug that was prescribed to patient 9983 for the last time until 42 months ago?
response: SELECT prescriptions.drug FROM prescriptions WHERE prescriptions.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 9983) AND DATETIME(prescriptions.startdate) <= DATETIME(CURRENT_TIME(), '-42 month') ORDER BY prescriptions.startdate DESC LIMIT 1