I never read the side effects warning. I just think if you read them you subconsciously develop them. Not that I haven't had reactions I just deal with them when they occur.
There is something to that, expect even by not reading about them, they still can happen.
Anti acids give me a headache, not the same day and not all the time but whenever I have a dull hours long headache I think back and recall taking some anti acid the last 24 hours. I tried a few types, all can give me headaches, some more then others.
So I changed my diet, no more soda before 12--1 pm, no soda after midnight. If it came to it, I would not have anymore soda at all before I took daily doses of anti acid