what was the name of the medication that patient 97733 was prescribed for the last time since 1 month ago?
select prescriptions.drug from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 97733 ) and datetime(prescriptions.startdate) >= datetime(current_time,'-1 month') order by prescriptions.startdate desc limit 1