tell me the name of the medication patient 63368 was last prescribed via po/ng route in 02/2104?
select prescriptions.drug from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 63368 ) and prescriptions.route = 'po/ng' and strftime('%y-%m',prescriptions.startdate) = '2104-02' order by prescriptions.startdate desc limit 1