how many times this year has patient 50065 been prescribed for promethazine?
select count(*) from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 50065 ) and prescriptions.drug = 'promethazine' and datetime(prescriptions.startdate,'start of year') = datetime(current_time,'start of year','-0 year')