Aziz Ali Akbari has been stripped of his world title and banned for life after testing positive for anabolic steroids at the world championships, the International Federation of Associated Wrestling Styles (FILA) said .
The 26-year-old, also a world champion in the 96kg category in 2010, won gold in the 120kg category in Greco-Roman style wrestling in September in Budapest, Hungary.
However, FILA announced in a statement that "since this was his second positive doping test, he is no longer eligible to compete in FILA events".
Silver medalist Heiki Nabi from Estonia has been promoted to gold.
Riza Kayaalp, from Turkey, will be awarded the silver medal and Nurmakhan Tinaliyev from Kazakhstan and Johan Magnus Euren from Sweden will be the bronze medalists in the weight class.
Nabi was a gold medalist in the 2006 World Championships and won a silver medal at the 2012 Olympic Games in London.
"We are serious about making our sport drug free and protecting those athletes who are abiding by the rules," said FILA President Nenad Lalovic.
"It has not been a problem for us in the past and we want to continue that pattern in our sport."