what was the first dose of albumin 25% (12.5gm) in this month given to patient 17462?
select prescriptions.dose_val_rx from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 17462 ) and prescriptions.drug = 'albumin 25% (12.5gm)' and datetime(prescriptions.startdate,'start of month') = datetime(current_time,'start of month','-0 month') order by prescriptions.startdate asc limit 1