Which opioid is a phenylpiperidine?

Which opioid is a phenylpiperidine?

• A. Fentanyl
• B. Methadone
• C. Hydromorphone
• D. Naloxone

Answer: (A)

Phenylpiperidine opioids are built around a piperidine ring attached to a phenyl-containing side chain. This structural motif is characteristic of certain synthetic opioids and helps explain their high potency and rapid onset. Fentanyl fits this pattern with its piperidine ring linked to a phenyl-containing scaffold, making it a classic example of a phenylpiperidine. Methadone has a different backbone (a diphenylheptanone) and is not classified as a phenylpiperidine. Hydromorphone comes from the morphinan/phenanthrene family and lacks the piperidine ring structure. Naloxone is also a morphinan derivative but functions as an antagonist, with a different core structure, not a phenylpiperidine. So, the opioid that is a phenylpiperidine is fentanyl.

Phenylpiperidine opioids are built around a piperidine ring attached to a phenyl-containing side chain. This structural motif is characteristic of certain synthetic opioids and helps explain their high potency and rapid onset.

Fentanyl fits this pattern with its piperidine ring linked to a phenyl-containing scaffold, making it a classic example of a phenylpiperidine. Methadone has a different backbone (a diphenylheptanone) and is not classified as a phenylpiperidine. Hydromorphone comes from the morphinan/phenanthrene family and lacks the piperidine ring structure. Naloxone is also a morphinan derivative but functions as an antagonist, with a different core structure, not a phenylpiperidine.

So, the opioid that is a phenylpiperidine is fentanyl.