USAntibiotics, an American maker of penicillin-based Amoxicillin and Amoxil Clavulanate, has reopened its Bristol, Tenn. manufacturing facility, which had slipped into bankruptcy and ceased operations last year. The event marks the first time the facility is under American ownership.    When the 360,000-square foot facility comes online, it will have the capacity to produce 300 million capsules and two billion tablets annually and can manufacture and stockpile a five-year supply of Amoxicillin f...