when was patient 85131 prescribed the drug neo*iv*chlorothiazide and d5w at the same time for the last time until 19 months ago?
select t1.startdate from ( select admissions.subject_id, prescriptions.startdate from prescriptions join admissions on prescriptions.hadm_id = admissions.hadm_id where prescriptions.drug = 'neo*iv*chlorothiazide' and admissions.subject_id = 85131 and datetime(prescriptions.startdate) <= datetime(current_time,'-19 month') ) as t1 join ( select admissions.subject_id, prescriptions.startdate from prescriptions join admissions on prescriptions.hadm_id = admissions.hadm_id where prescriptions.drug = 'd5w' and admissions.subject_id = 85131 and datetime(prescriptions.startdate) <= datetime(current_time,'-19 month') ) as t2 on t1.subject_id = t2.subject_id where datetime(t1.startdate) = datetime(t2.startdate) order by t1.startdate desc limit 1