i HAVE BEEN ON 20 MG. OF AMBIEN FOR ABOUT 7 YRS. JUST CHANGED DOCTORS. AS i MOVED AND HE AND ALL THE PHARMACISTS NOW SAY THE MAX DOSE IS 10 MG. WHEN i FIRST STARTED TAKING AMBIEN i REMEMBER THE PAMPHLET SAYING IT COULD GO UP TO 25 MG. WHAT IS GOING ON