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Many patients with mild symptoms can control their heartburn by simply avoiding conditions likely to cause it. Now, new competitors with names like Zantac and Tagamet are mixing it up. Loren Fefer, a gastroenterologist at UC Davis Medical Group, Auburn, sympathizes with the confusion. He sees patients daily who suffer from symptoms of heartburn, often described as a burning or painful sensation behind the breastbone, sometimes with an acid or bitter taste in the mouth.