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Methypyron Wiki Str.png
Clinical data
Trade namesDimerin, Methyprylone, Noctan, Noludar
Routes of
ATC code
Legal status
Legal status
Pharmacokinetic data
Protein binding60%
Elimination half-life6-16 hours
CAS Number
PubChem CID
E number{{#property:P628}}
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Chemical and physical data
Molar mass183.248 g/mol
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Methyprylon (Noludar) is a sedative of the piperidinedione derivative family developed by Hoffmann-La Roche.[1] This medicine was used for treating insomnia, but is now rarely used as it has been replaced by newer drugs with fewer side effects, such as benzodiazepines.[2] Methyprylon was withdrawn from the US market in June 1989 and the Canadian market in September 1990. Some other trade names are Noctan and Dimerin.

Adverse effects

Side effects can include skin rash, fever, depression, ulcers or sores in mouth or throat, unusual bleeding or bruising, confusion, fast heartbeat, respiratory depression, swelling of feet or lower legs, dizziness, drowsiness, headache, double vision, clumsiness, constipation, diarrhea, nausea, vomiting, unusual weakness.[citation needed]


A study of single oral doses of 300 mg in healthy volunteers found that the zero-order absorption model fit the data best. Mean (+/- SD) values for the half-life (9.2 +/- 2.2 h), apparent clearance, (11.91 +/- 4.42 mL/h/kg) and apparent steady-state volume of distribution, (0.97 +/- 0.33 L/kg) were found.[3]

A case report found that the pharmacokinetics of methyprylon were not concentration dependent in an overdose case; explanations included saturation or inhibition of metabolic pathways. The generally accepted half-life for a therapeutic dose was not found appropriate in intoxicated patients and would underestimate the time required to reach a safe concentration of the drug.[4]

See also


  1. US patent 2680116, Frick, H. & Lutz, A. H., "Piperidiones and Process for the Manufacture thereof", issued 1954-06-01, assigned to Hoffmann-La Roche 

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    Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] == Overview ==

  2. PMID 16792 (PMID 16792)
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  3. PMID 2866242 (PMID 2866242)
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  4. PMID 1686463 (PMID 1686463)
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