“ Cannabis users and non-users received similar doses, but users had 2.7-fold higher concentrations of buprenorphine ( p < 0.01) and 1.4-fold for norbuprenorphine (1.4-fold, p = 0.07).”
“These findings indicate that cannabis use decreases the formation of norbuprenorphine and elevates buprenorphine and norbuprenorphine concentrations in blood most probably by inhibition of CYP3A4.”