Buprenorphine on opioid receptors is:
Pure morphine like opioids in general acts on Mu and K receptors. Mixed agonists-antagonists: Nalorphine Butorphanol Pentazocine Paial agonists: Buprenorphine Pure competitive opioid antagonists Naloxone Naltrexone Nalmefene Ref: K.D.T 6th Ed Page 464.
Pure agonist
Pure antagonist
Paial agonist
None