My Baby Is 5 Months Old.she Had Almost Stopped Sucking

My baby is 5 months old.she had almost stopped sucking breatmilk by 1and half months as it was inadequate for her.I was having leptaden tablets,satavarex and perinorm as advised by my doctor...now my baby is completely on formula Similac advance1 and i dont see milk coming from my breast...Is it possible for me to restart breast feeding my baby.. atleast partially along with formula.what should i do to get breastmilk??