Question:
Structure of hybrid in methadone and meperidine
Structure of hybrid in methadone and meperidine
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Tramadol's structure combines features of both methadone and meperidine, giving it opioid and non-opioid analgesic properties.
Updated On: Jul 14, 2026
- Pentazocine
- Tramadol
- Methotrexate
- Labetalol
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The Correct Option is B
Approach Solution - 1
- Tramadol is a centrally acting analgesic with a dual mechanism of action: weak $\mu$-opioid receptor agonist and inhibition of serotonin and norepinephrine reuptake.
- Structurally, it is considered a hybrid of methadone and meperidine.
- Methadone is a synthetic opioid with a phenylpropylamine backbone, while meperidine contains a piperidine ring structure.
- Tramadol contains a methadone-like side chain with a meperidine-like structure in its basic amine and ether functionality.
- This hybrid structure contributes to its analgesic efficacy and unique pharmacological profile.
- Structurally, it is considered a hybrid of methadone and meperidine.
- Methadone is a synthetic opioid with a phenylpropylamine backbone, while meperidine contains a piperidine ring structure.
- Tramadol contains a methadone-like side chain with a meperidine-like structure in its basic amine and ether functionality.
- This hybrid structure contributes to its analgesic efficacy and unique pharmacological profile.
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Approach Solution -2
The question asks which drug is structurally described as a hybrid of methadone and meperidine. Let's look at what each option actually is.
- Pentazocine: Pentazocine is a benzomorphan-derived opioid agonist-antagonist. Its ring system is built on the benzomorphan skeleton, not on the phenylpropylamine and piperidine features seen in methadone and meperidine, so it does not fit a methadone-meperidine hybrid description.
- Tramadol: Tramadol carries an aminocyclohexanol core attached to a methoxyphenyl group, arranged so that part of its skeleton resembles methadone's open-chain diphenyl-aminobutane arrangement while another part resembles meperidine's phenyl-substituted amine. This dual resemblance is why pharmacology texts describe tramadol as a structural hybrid of the two.
- Methotrexate: Methotrexate is a folic acid antagonist built around a pteridine ring joined to para-aminobenzoic acid and glutamic acid. It is an anticancer/antimetabolite drug with no opioid analgesic backbone at all, so it cannot be a hybrid of two opioids.
- Labetalol: Labetalol is a combined alpha and beta adrenergic blocker used for hypertension, built on an ethanolamine-phenyl scaffold. It has no structural relationship to methadone or meperidine.
Only tramadol combines features drawn from both methadone and meperidine in one molecule, which also explains its mixed action as a weak opioid agonist with added monoamine reuptake inhibition.
Therefore, the correct answer is Tramadol.
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