"The lethal dose of alcohol divided by a typical recreational dose (safety ratio) is 10, which places it closer to heroin (6), and GHB (8) in terms of danger from overdose, than MDMA ('Ecstasy' – 16), and considerably more dangerous than LSD (1000) or cannabis (>1000)."
Source
Sellman, Doug, "If alcohol was a new drug," Journal of the New Zealand Medical Association. Wellington, New Zealand: New Zealand Medical Association, September 2009.