since 50 months ago has patient 99747 been prescribed calcium gluconate, labetalol, or meropenem?
select count(*)>0 from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 99747 ) and prescriptions.drug in ( 'calcium gluconate', 'labetalol', 'meropenem' ) and datetime(prescriptions.startdate) >= datetime(current_time,'-50 month')