<<Disclaimer: Verify this information before applying it to your situation.>> I note as I look through "A Guide Through the Medicine Cabinet" that Prolosec says it "may contain gluten and lactose." Since several people have mentioned to me that they take prilosec for the acid problems arising from gluten accidents, I thought I'd mention this. I take Prevacid, which does the same thing perhaps better, but it's GF and lactose free. I was afraid that some of you who have gluten accidents, which generates an acid reaction, then take prilosec may be involved in a viscious circle of acid generation. -vance