The announcement sent the nation's 34 death penalty states scrambling to find a new supplier. Some canceled executions, while others obtained the drug from England, but then had it confiscated by federal agents amid questions they circumvented the law to obtain it because that country has banned the drug's export for executions.
"The Virginia protocol for lethal injection has been litigated and has been found to be constitutionally acceptable by every court in Virginia that has looked at it ... and we are confident that the change to allow the drug pentobarbital to be substituted for sodium thiopental in the protocol will be found to be constitutionally acceptable, as well," Gottstein said.
Pentobarbital has survived legal challenges in other states and has been used for recent executions in Oklahoma, Ohio and South Carolina.
Virginia is home to the nation's second-busiest death chamber, behind Texas. There currently are no scheduled executions.