when did patient 26286 get prescription for labetalol hcl and sodium chloride 3% (hypertonic) for the last time at the same time in this month?
select t1.startdate from ( select admissions.subject_id, prescriptions.startdate from prescriptions join admissions on prescriptions.hadm_id = admissions.hadm_id where prescriptions.drug = 'labetalol hcl' and admissions.subject_id = 26286 and datetime(prescriptions.startdate,'start of month') = datetime(current_time,'start of month','-0 month') ) as t1 join ( select admissions.subject_id, prescriptions.startdate from prescriptions join admissions on prescriptions.hadm_id = admissions.hadm_id where prescriptions.drug = 'sodium chloride 3% (hypertonic)' and admissions.subject_id = 26286 and datetime(prescriptions.startdate,'start of month') = datetime(current_time,'start of month','-0 month') ) as t2 on t1.subject_id = t2.subject_id where datetime(t1.startdate) = datetime(t2.startdate) order by t1.startdate desc limit 1