Drugs Such as Butorphanol,nalbuphine,and Pentazocine May Stimulate Certain Opioid Receptors

Drugs such as butorphanol,nalbuphine,and pentazocine may stimulate certain opioid receptors while blocking or only partially activating other receptors.These drugs

A) may produce adequate analgesia with less risk of side effects such as respiratory depression
B) may have fewer addictive qualities than strong opioids such as morphine
C) may produce more psychotropic effects (hallucinations, vivid dreams) than other opioids
D) are known as mixed agonist-antagonists
E) all the above are true