I have been on Previcid for 11 years - 30 mg twice a day. I finally got my doctor to decrease the dosage to 1 a day and I never have acid reflux now. However, I recently heard about a study that says people on Previcid for long periods of time have a greater tendency (40%) for dementia. That scared the Be-Jesus out of me! I stopped taking it altogether. I was OK for about 2 weeks but acid reflux has come back with a vengeance. I drink cider vinegar with water twice a day, have been taking Rolaids and have just started a Pribiotic that I got at Walgreens yesterday. I am OK until about mid afternoon when it starts. Help me please!