Police say an 11-year-old girl had to be revived with the antidote Narcan after a drug overdose in her Pittsburgh home.Officers were called to the home Wednesday for a suspected overdose. A paramedic who responded the Post-ells tGazette the girl was using heroin.Investigators told the Post-Gazette they found multiple stamp bags of heroin near the girl, and at least one bag was open. The girl's 20-year-old sister said Thursday the family had no idea that the 11-year-old was using heroin until police officers discovered the stamp bags.Family members didn't notice any odd behavior or recognize signs of drug abuse before the girl overdosed, she said.