Prescription painkilling drugs known as opioids, including counterfeit versions of them, are killing more people than any other drugs that exist. This has created a full-blown health crisis in the United States-one that has led U.S. health officials to declare a public health emergency.

When medicine kills -- A growing health crisis -- Highly addictive drugs -- The high risks of opioid abuse -- Treatment and recovery challenges -- The fight to prevent opioid abuse.