what are the five most commonly prescribed medications for patients that have been previously prescribed iso-osmotic dextrose within the same hospital visit, in 2105?
select t3.drug from ( select t2.drug, dense_rank() over ( order by count(*) desc ) as c1 from ( select admissions.subject_id, prescriptions.startdate, admissions.hadm_id from prescriptions join admissions on prescriptions.hadm_id = admissions.hadm_id where prescriptions.drug = 'iso-osmotic dextrose' and strftime('%y',prescriptions.startdate) = '2105' ) as t1 join ( select admissions.subject_id, prescriptions.drug, prescriptions.startdate, admissions.hadm_id from prescriptions join admissions on prescriptions.hadm_id = admissions.hadm_id where strftime('%y',prescriptions.startdate) = '2105' ) as t2 on t1.subject_id = t2.subject_id where t1.startdate < t2.startdate and t1.hadm_id = t2.hadm_id group by t2.drug ) as t3 where t3.c1 <= 5