Inverse agonist of benzodiazepine receptor is:
## **Core Concept**
The question tests understanding of the pharmacology of benzodiazepine receptors, specifically the concept of inverse agonists. Benzodiazepine receptors are part of the GABA_A receptor complex, which is involved in inhibitory neurotransmission in the brain. Inverse agonists at these receptors decrease the activity of the receptor below the baseline level seen with no drug present.
## **Why the Correct Answer is Right**
The correct answer, , acts as an inverse agonist at the benzodiazepine receptor site. This means it binds to the same receptor site as benzodiazepines but decreases the frequency of chloride channel opening, thereby reducing GABA_A receptor activity. This results in anxiogenic (anxiety-producing), proconvulsant, and convulsant effects, opposite to the therapeutic effects of benzodiazepines.
## **Why Each Wrong Option is Incorrect**
- **Option A:** is a benzodiazepine itself and acts as an agonist, enhancing the effect of GABA at the GABA_A receptor. Therefore, it is not an inverse agonist.
- **Option B:** is not typically classified as an inverse agonist at benzodiazepine receptors; its primary action is not relevant here.
- **Option C:** This option might seem plausible but is not the correct inverse agonist for benzodiazepine receptors.
## **Clinical Pearl / High-Yield Fact**
A key point to remember is that inverse agonists at the benzodiazepine receptor, like , can induce anxiety and seizures, which is clinically significant in understanding the potential side effects and therapeutic applications of drugs acting on the GABA_A receptor complex.
## **Correct Answer:** .