what was the drug patient 22648 had been prescribed two or more times in this month?
select t1.drug from ( select prescriptions.drug, count( prescriptions.startdate ) as c1 from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 22648 ) and datetime(prescriptions.startdate,'start of month') = datetime(current_time,'start of month','-0 month') group by prescriptions.drug ) as t1 where t1.c1 >= 2