PENICILLIN is a japanese rock band who formed in 1992 in Kanagawa, Japan. The members consist of vocalist HAKUEI, guitarist 千聖 (Chisato), bassist GISHO, and drummer O-JIRO. Their first offical release was PENICILLIN SHOCK which was released on May 30, 1994. Their most recent release was the album BLUE HEAVEN on February 28, 2007. On March 09, 2007 Gisho announced that he would be leaving PENICILLIN for personal reasons.