Rilmazafone

Rilmazafone[1] (リスミー, Rhythmy, previously known as 450191-S) is a water-soluble benzodiazepine prodrug developed in Japan.[2] It has sedative and hypnotic effects.[3][4] Rilmazafone induces impairment of motor function and has hypnotic properties.[5]

Rilmazafone
Clinical data
Trade namesRhythmy
Other names5-([(2-aminoacetyl)amino]methyl)-1-[4-chloro-2-(2-chlorobenzoyl)phenyl]-N,N-dimethyl-1,2,4-triazole-3-carboxamide
AHFS/Drugs.comInternational Drug Names
Routes of
administration		Oral (tablets)
ATC code
  • none
Legal status
Legal status
  • ℞-only (JP)
Pharmacokinetic data
Elimination half-life10.5 h
ExcretionUrine
Identifiers
CAS Number
PubChem CID
ChemSpider
UNII
KEGG
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC21H20Cl2N6O3
Molar mass475.328 g/mol g·mol−1
3D model (JSmol)
  (verify)

Rilmazafone has no effects on benzodiazepine receptors itself, but once inside the body is metabolised by aminopeptidase enzymes in the small intestine to form the active benzodiazepine 8-chloro-6-(2-chlorophenyl)-N,N-dimethyl-4H-1,2,4-triazolo [1,5-a][1,4]benzodiazepine-2-carboxamide.[6][7]

Rilmazafone active metabolite

See also

References
  1. DE Patent 2725164
  2. Yamamoto K, Hirose K, Matsushita A, Yoshimura K, Sawada T, Eigyo M, Jyoyama H, Fujita A, Matsubara K, Tsukinoki Y, et al. Pharmacological studies of a new sleep-inducer, 1H-1,2,4-triazolyl benzophenone derivatives (450191-S) (I). Behavioral analysis. Nippon Yakurigaku Zasshi. 1984 Jul;84(1):109-54. (Japanese).
  3. Yamamoto K, Matsushita A, Sawada T, Naito Y, Yoshimura K, Takesue H, Utsumi S, Kawasaki K, Hirono S, Koshida H, et al. Pharmacology of a new sleep inducer, 1H-1,2,4-triazolyl benzophenone derivative, 450191-S (II). Sleep-inducing activity and effect on the motor system. Nippon Yakurigaku Zasshi. 1984 Jul;84(1):25-89. (Japanese).
  4. Ibii N, Horiuchi M, Yamamoto K. Pharmacology of a 1H-1, 2, 4-triazolyl benzophenone derivative (450191-S), a new sleep-inducer (III). Behavioral study on interactions of 450191-S and other drugs in mice. Nippon Yakurigaku Zasshi. 1984 Aug;84(2):155-73. (Japanese).
  5. Yasui M; Kato A; Kanemasa T; Murata S; Nishitomi K; Koike K; Tai N; Shinohara S; Tokomura M; Horiuchi M; Abe K. (June 2005). "[Pharmacological profiles of benzodiazepinergic hypnotics and correlations with receptor subtypes]". Nihon Shinkei Seishin Yakurigaku Zasshi. 25 (3): 143–51. PMID 16045197.
  6. Koike M, Norikura R, Sugeno K. Intestinal activation of a new sleep inducer 450191-S, a 1H-1,2,4-triazolyl benzophenone derivative, in rats. Journal of Pharmacobiodynamics. 1986 Mar;9(3):315-20.
  7. Muranushi N, Miyauchi S, Suzuki H, Sugiyama Y, Hanano M, Kinoshita H, Oguma T, Yamada H. Comparative hepatic transport of desglycylated and cyclic metabolites of rilmazafone in rats: analysis by multiple indicator dilution method. Biopharmaceutics and Drug Disposition. 1993 May;14(4):279-90.
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