HYONATOL, WHAT IS THIS USED FOR ?

MY FRIEND HAS BEGUN SEEING A DOCTOR FOR WEIGHT CONTROL. ALONG WITH SEVERAL OTHER MEDICATIONS, HE PRESRIBED HYONATOL. HE EXPLAINED WHAT THE OTHER MEDICATIONS WERE FOR BUT WAS RATHER VAGUE ABOUT THIS ONE. I HAVE TRIED TO HELP HER BY LOOKING THIS DRUG UP BUT STILL THE DESRIPTIONS GIVEN DON'T SEEM TO APPLY TO HER. SHE DOESN'T HAVE CRAMPING OR THE OTHER LISTED REASONS FOR TAKING THIS. WHY WOULD HE HAVE PRESCIBED THIS FOR HER TWICE A DAY? DOES SHE REALLY NEED THIS TO HELP HER LOSE WEIGHT? I KNOW SHE SHOULD HAVE ASKED HIM AT THE TIME BUT IT WAS ALL SO NEW TO HER THAT SHE WAS A BIT OVERWELMED AND SHE JUST DIDN'T THINK OF IT UNTIL LATER. CAN YOU HELP US? THANK YOU.