i had been on zoton for at least 7 years to treat a stomach erosion up until a year ago and my gp upped the dose last year but then i was having terrible wind and then developed i.b.s so they put me on 20 mg of omeprazole i was o/k for a few months and it started again so i recently visited my gp who increased the dosage and the wind and pain again with i.b.s was terrible so he added another tablet for the i.b.s which didn't do anything by now i got so fed up that i went off both tablets and put myself on zantac at the moment the pain and i.b.s symptoms are slowly going away i will in a weeks time be seeing my gp to report my findings as i am pretty sure that omeprazole and its similar compounds are to blame