The Acting Administrator of the Drug Enforcement Administration is issuing this temporary scheduling order to extend the temporary schedule I status of beta-hydroxythiofentanyl (N-[1-[2- hydroxy-2-(thiophen-2-yl)ethyl]piperidin-4-yl]-N-phenylpropionamide) also known as N-[1-[2-hydroxy-2-(2-thienyl)ethyl]-4-piperidinyl]-N- phenylpropanamide including its isomers, esters, ethers, salts and salts of isomers, esters and ethers. The schedule I status of beta- hydroxythiofentanyl currently is in effect through May 12, 2018. This temporary order will extend the temporary scheduling of beta- hydroxythiofentanyl for one year, or until the permanent scheduling action for this substance is completed, whichever occurs first.