was the ampicillin-sulbactam prescribed to patient 1918 in their last hospital visit?
select count(*)>0 from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 1918 and admissions.dischtime is not null order by admissions.admittime desc limit 1 ) and prescriptions.drug = 'ampicillin-sulbactam'