Bisphenol A, a chemical commonly known as BPA and once widely used in canning and plastics, is unlikely to be harmful to people in the doses usually seen, the Food and Drug Administration said Friday. The FDA said a draft report on BPA’s effects in rats offers little to worry about. “Overall, the study found ‘minimal effects’ for the BPA-dosed groups of rodents,” Dr. Stephen Ostroff, an FDA deputy commissioner, said in a statement. “Our initial review supports our determination that currently authorized uses of BPA continue to be safe for consumers,” he added.