Taking aim at “America ’s most abused narcotic,” congressional lawmakers introduced legislation Wednesday that would place tighter restrictions on the painkiller hydrocodone, which is a key contributor to the nation’s prescription drug death epidemic. Sold under the brand names Vicodin, Norco and Lortab, hydrocodone-based medications “are some of the most potent and addictive narcotics on the market,” U.S. Rep. Vern Buchanan (R-Fla.) said in a statement.