Opioid Receptor Activity Chart

Agonism Opioid μ Activity δ Activity κ Activity Common Brand Name
Strong Morphine agonist agonist agonist MSContin
Strong Heroin agonist agonist agonist Smack, Dope, H
Strong Methadone agonist at high doses at high doses Methadose
Strong Hydromorphone agonist at high doses at high doses Dilaudid
Strong Meperidine agonist at high doses at high doses Demerol
Strong Fentanyl agonist at high doses at high doses Duragesic
Strong Alfentanil agonist at high doses at high doses Alfenta
Strong Sufentanil agonist at high doses at high doses Sufenta
Moderate to Weak Oxycodone agonist at high doses at high doses OxyContin
Moderate to Weak Hydrocodone agonist at high doses at high doses Vicodin
Moderate to Weak Codeine agonist at high doses at high doses Tylenol #3
Moderate to Weak Propoxyphene agonist at high doses at high doses Darvocet
Moderate to Weak Dextromethorphan agonist at high doses at high doses Robitussin DM
Moderate to Weak Diphenoxylate agonist at high doses at high doses Lomotil
Moderate to Weak Difenoxin agonist at high doses at high doses Motofen
Moderate to Weak Loperamide agonist at high doses at high doses Imodium AD
Mixed Agonist/Antagonist Nalbuphine agonist no activity agonist Nubain
Mixed Agonist/Antagonist Pentazocine partial agonist no activity agonist Talwin
Mixed Agonist/Antagonist Butorphanol partial agonist no activity agonist Stadol
Mixed Agonist/Antagonist Buprenorphine partial agonist no activity antagonist Buprenex
Antagonists Naloxone antagonist antagonist antagonist Narcan
Antagonists Naltrexone antagonist antagonist antagonist Revia

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