"Interesting Drug" was the fourth single released by Morrissey. The song was not featured on one of Morrissey's main studio albums, but can be found on the compilation album Bona Drag along with the B-side "Such a Little Thing Makes Such a Big Difference". The artwork for the single features Morrissey photographed by Lawrence Watson. It features Kirsty MacColl on backing vocals as well as his former colleagues in The Smiths, Andy Rourke, Mike Joyce and Craig Gannon. All three also appear on the B-side. It was to be Morrissey's last Top 10 single until 1994.