This is Dr. David
if you are still having heart burn, then the ranitidine (also called zantac) may not be enough
you may need stronger stomach acid blockers like prilosec 20mg and ranitidine at night time to decrease stomach acid
you may have to change your diet and avoid alcohol, spicy foods, tomato sauces, sodas, fried foods, large meals, oily foods to help your stomach
you may have to eat more fruits and vegetables to help your constipation
or use stool softeners like docusate sodium
or eat prunes daily or use fiber supplements like metamucil or other psyllium fiber supplements to help your constipation.
low stomach acid would not cause heart burn.
what is your diet like? are there improvements in your diet that you can make to help your heart burn and constipation symptoms?