for the first time in 03/this year, what was the drug that patient 40116 was prescribed via iv bolus route?
select prescriptions.drug from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 40116 ) and prescriptions.route = 'iv bolus' and datetime(prescriptions.startdate,'start of year') = datetime(current_time,'start of year','-0 year') and strftime('%m',prescriptions.startdate) = '03' order by prescriptions.startdate asc limit 1