Never heard of this either. Seems it is better known as Naltrexone.
There's a bunch of info on it on
Erowid.
Quote:Naltrexone is an opiate antagonist used in the treatment of opiate and alcohol addiction. It blocks the effects of opiates so that if a user chooses to take an opiate after taking naltrexone, they do not experience much, if any, effect. This helps improve abstinence in those who can maintain taking the daily dose of naltrexone.
Reading through the
experience vault makes me think this might not be for me though

.
thanks for sharing though! you learn something every day
