in this year vancomycin, oxycodone liquid or ns (mini bag plus) have been prescribed for patient 8421?
select count(*)>0 from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 8421 ) and prescriptions.drug in ( 'vancomycin', 'oxycodone liquid', 'ns (mini bag plus)' ) and datetime(prescriptions.startdate,'start of year') = datetime(current_time,'start of year','-0 year')