I take Betaine HCl w Pepsin, and it really helps me to feel better over all. I'm glad I found this warning. I know from experience that OTC meds like @dv1l will strip the stomach of its protective mucous lining.
1. People using non-steroidal anti-inflammatory drugs such as ibuprofen (NSIADs), cortisone-like drugs, or other medications with the potential to cause a peptic ulcer (a break or sore in the tissue lining the upper digestive tract) should avoid supplementation with Betaine hydrochloride.
found here: http://www.prohealth.com/
Milton Keynes, Uk