Which of the following is 100 times more potent than morphine?
**Core Concept**
Fentanyl is a synthetic opioid analgesic with a high potency compared to morphine, which is used for pain management in clinical settings.
**Why the Correct Answer is Right**
Fentanyl is 100 times more potent than morphine due to its high lipid solubility, which allows it to readily cross the blood-brain barrier and bind to opioid receptors in the central nervous system. This results in a significant increase in analgesic effectiveness, making fentanyl a valuable option for managing severe pain, especially in patients with opioid tolerance.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided. Please ensure that all options are presented for a complete explanation.
**Option B:** Although some opioids are more potent than morphine, they are not 100 times more potent. For instance, heroin is approximately 2-4 times more potent than morphine.
**Option C:** This option is not provided. Please ensure that all options are presented for a complete explanation.
**Option D:** This option is not provided. Please ensure that all options are presented for a complete explanation.
**Clinical Pearl / High-Yield Fact**
When using fentanyl, clinicians must be aware of its high potency and potential for respiratory depression, which can be life-threatening in overdose situations.
**Correct Answer:** B. Fentanyl