be careful of antacids, they can cause constipation if you take too many. I like tritilac and renetidine
Zantac is also perfectly fine and works better for me, I take 150mg every 12h as I need it, seems to work best if you take it on an empty stomach with a good size glass of water about 45min-1h before eating
Yeah . .atleast according to my doctors. They are actually an added source of calcium as well. Unless you have special precautions you need to take when it comes to calcium, you should be fine.