what is the total dosage of levothyroxine sodium that patient 5887 has been prescribed in 11/this year?
select sum(prescriptions.dose_val_rx) from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 5887 ) and prescriptions.drug = 'levothyroxine sodium' and datetime(prescriptions.startdate,'start of year') = datetime(current_time,'start of year','-0 year') and strftime('%m',prescriptions.startdate) = '11'