@neologist,
It's very individual depending on how bad your reflux is. My GERD is pretty bad so that if were to take less than my one pill per day, I suffer the next day. There is NO cutting the dosage for me...or I pay and pay.
Now if your situation is one where you drink no red wine, drink no coffee, eat tomatoes and avoid chocolate ... and can afford having less meds without any suffering... you probably didn't need the med in the first place.