Partial agonist of opioid is –
**Partial Agonist of Opioid**
### Core Concept
Partial agonists at the opioid receptor are compounds that bind to the receptor but only activate it partially, resulting in a reduced response compared to full agonists. This property is utilized in the development of drugs with a reduced risk of side effects and overdose.
### Why the Correct Answer is Right
The correct answer is a type of compound that has a partial agonist activity at the mu-opioid receptor. When this compound binds to the receptor, it activates the G-protein coupled signaling pathway, but to a lesser extent than a full agonist. This reduced activation leads to a decrease in the intensity of the opioid response, including analgesia, euphoria, and respiratory depression.
### Why Each Wrong Option is Incorrect
**Option A:** This is incorrect because it is a full agonist at the mu-opioid receptor, which means it activates the receptor fully and produces a more intense response compared to a partial agonist.
**Option B:** This is incorrect because it is an antagonist at the mu-opioid receptor, which means it blocks the receptor and prevents activation by agonists.
**Option C:** This is incorrect because it is a mixed agonist-antagonist at the mu-opioid receptor, which means it has both agonist and antagonist properties at different concentrations.
### Clinical Pearl / High-Yield Fact
Partial agonists are useful in the treatment of opioid use disorder, as they can provide analgesia without the risk of euphoria and addiction associated with full agonists.
### Correct Answer: B. Nalbuphine