Prevacid is a pump inhibitor, which in my (un-medically-trained) mind is the most common and effective treatment for GERD (Gastroesophageal reflux disease). Basically, it should have cut down on the amount of acid being produced in your girlfriend's stomach. It's interesting that it's not worked for her. If she didn't take it in large enough doses or for a long enough period of time, she may not have benefitted from the medication. However, maybe the medication is not right for her (or maybe she has a different form of GERD?). Personally, I've been on losec for quite some time now (also a pump inhibitor), and it's the bees knees. Seriously. When I was first put on it, I was on a double dose daily, but quickly moved to a single dose. Antacids are partially useful, but not for long term relief. There are also a few tricks people can employ to decrease the effects of GERD and heartburn (sleeping positions, dietary changes, etc). The foregoing stands to be corrected.
Google: as helpful as ever...
http://www.google.ca/search?hl=en&ie...e+Search&meta=