Prescription drug labels will be easier to read and updated quickly on the Internet as part of an effort being launched later this year to improve information for doctors and patients, a U.S. health official said on Wednesday.Regulators have been promising a major revamp of prescribing instructions for years. Labels for physicians now run several pages and have side-effect information scattered throughout. It can take months for new warnings to be added.Rules outlining a new format will be issued soon, said Dr. Scott Gottlieb, the Food and Drug Administration deputy commissioner for medical and scientific affairs. He declined to provide details.