how much miconazole powder 2% was last prescribed to patient 41132 until 38 months ago dosage?
select prescriptions.dose_val_rx from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 41132 ) and prescriptions.drug = 'miconazole powder 2%' and datetime(prescriptions.startdate) <= datetime(current_time,'-38 month') order by prescriptions.startdate desc limit 1