Meprobamate

Meprobamate—marketed as Miltown by Wallace Laboratories and Equanil by Wyeth, among others—is a carbamate derivative used as an anxiolytic drug. It was the best-selling minor tranquilizer for a time, but has largely been replaced by the benzodiazepines due to their wider therapeutic index (lower risk of toxicity at therapeutically prescribed doses) and lower incidence of serious side effects.

Meprobamate
Clinical data
Trade namesMiltown, Equanil, Meprospan, Amepromat, Quivet, Zirponand, and many others
AHFS/Drugs.comMonograph
MedlinePlusa682077
Pregnancy
category
  • AU: C
Routes of
administration
Oral
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability?
MetabolismHepatic
Elimination half-life10 hours
ExcretionRenal
Identifiers
  • [2-(carbamoyloxymethyl)-2-methyl-pentyl] carbamate
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.000.306
Chemical and physical data
FormulaC9H18N2O4
Molar mass218.253 g·mol−1
3D model (JSmol)
Density1.229 g/cm3
Melting point105 to 106 °C (221 to 223 °F)
Boiling point200 °C (392 °F) to 210 °C (410 °F)
  • O=C(N)OCC(C)(CCC)COC(N)=O
  • InChI=1S/C9H18N2O4/c1-3-4-9(2,5-14-7(10)12)6-15-8(11)13/h3-6H2,1-2H3,(H2,10,12)(H2,11,13) Y
  • Key:NPPQSCRMBWNHMW-UHFFFAOYSA-N Y
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