MY SISTER IS PREGNENT WITH 35WKS 02DAYS. REPORTS WAS DONE

MY SISTER IS PREGNENT WITH 35WKS 02DAYS. REPORTS WAS DONE ON 22/09/2015. IN THE REPORTS IT IS MENTIONED THAT (GESTATION AGE IS SCALE BY BPD & FL IS 35WKS 01DAY. LIQUOR IS MODERATELY LESS. PLACENTA IS PLACED ANTERIORLY AWAY FROM INT OS. FETAL HEART RATE IS 140/MIN. FETAL MOVEMENT ARE NORMAL) & DOCTOR HAS PRESCRIBED HER ARG 9 .
I WANT TO KNOW WHY DR HAS PRESCRIBED ARG 9..? PLEASE ANSWER ME & GUIDE ME RIGHT TREATMENT