It's actually very mild. I have one most days but not every day. The instructions say do not take more than 16 tablets a day!
I don't want to go onto anything stronger like zantac or omeprazole as both may cause long term problems. Also, it boosts my calcium!
I seemed to only rarely suffer it, rarely took the tablets - but one night suffered a bleed (they call it coffee grounds) and had to be rushed in, in shock. Ended up on intravenous for two days there, now on daily lansoprazole, to replace the omeprazole, which they put me on at first.