whether use of omeprazole 20 mg is safe if I have been suffering from acidity since a long time & heart burn problem since a month? If yes, what should be its dose & how long should I continue to take it? I have been using rabeprazole 20 mg with domperidone 30 mg since last five years. I just want to switch to another drug as i'm still not cured. Kindly advice me.