I have seen the crude extract for sale before but I was always sceptical of its safety, mainly because of unrealiable concentrations of the Dopamine antagonists Glaucine, and Tetrahydropalmatine, and the acetylcholinesterase inhibitor Corydaline.
THP or Tetrahydropalmatine is whats used as the painkiller in pharmaceutical extracts of the plant. which does have ligitimate use in pharmacy but its obviosly not harmless.
case of poisoning
so even if your taking a refined pharmaceutical grade extract which certantly can help, its not without risk, my personal opinion is that there are other drugs that have helped in aiding recovering addicts with a more favourable safety profile.
also the chemical
Palmatine, another isolate of C. Yanhusuo has an incredible history of use in the medical field, which is another great topic.