Hi , I have been experiencing heartburn to the point I can t sleep, it seems to be right where the ribs meet at the top, in my diaphram. I have recently been on a prescription for clav 500/125mg for possibly pneumonia , and just wondered what the difference between Zantac 150mg and which I was buying at the drugstore that relieved the pain, and Tecta 40 mg that the clinic Dr. put me on this morning was? Will it work the same way and give me relief? Thank you, Debbie