How Long Can Course Of Mucosta Be Continued?

Hi my name is Christian i use mucosta for about 1,5 years now 100 mg 1 pills a day, in 2008 i was in the philippines on hollyday an i have a many problems with asid so i have many years eat nexium 40 mg.then im my hollyday in the philippines it be very bad so i go to a doktor and the doktor said take a mucosta in the morning and midday take your nexium.I just want to know is it to long i have take that mucosta do i have to stop.