what is the name of the medication that patient 23760 was last prescribed when they came to the hospital last time?
select prescriptions.drug from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 23760 and admissions.dischtime is not null order by admissions.admittime desc limit 1 ) order by prescriptions.startdate desc limit 1