MY WIFE ( AGE 58) HAVE BEEN TAKING REPLOL H

MY WIFE ( AGE 58) HAVE BEEN TAKING REPLOL H SINCE LAST AROUND 3 MONTHS. RECENTLY, SINCE LAST ABOUT 15 DAYS, IN THE MORNING WHILE GETTING UP FROM BED SHE IS FEELING LIKE EVERYTHING IS MOVING AROUND . SHE TOOK VIRTIGO TABLETS FOR 15 DAYS, BUT STILL SHE IS NOT WELL. NOW TODAY CARDIOLOGIST HAS PRESCRIBED TAZLOC H 80 IN PLACE OF REPLOL H FOR 1 WEEK. WHAT COULD BE THE REASON ?