What is the main metabolite of cyproheptadine?
Cyproheptadine is metabolized primarily in the liver, and its main metabolite is commonly reported as norcyproheptadine (also called N-desmethylcyproheptadine).
How is cyproheptadine metabolized into norcyproheptadine?
Norcyproheptadine forms through N-demethylation of cyproheptadine, producing the desmethyl (N-demethylated) metabolite that is often described as the major circulating product.
Does the “main metabolite” depend on the body fluid or study?
Yes. “Main metabolite” can vary depending on:
- the biological matrix measured (plasma/urine vs. tissues),
- the assay and detection methods used,
- the patient population and dosing regimen.
But across standard pharmacokinetic descriptions, norcyproheptadine is the metabolite most often identified as the principal one.
Is norcyproheptadine pharmacologically active?
Norcyproheptadine has pharmacologic activity, but it is typically discussed as a metabolite with activity that may differ from the parent drug in potency and overall clinical relevance.
Sources
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