Patent · US Expired

Cimetidine monohydrate

US4579954A · kind A · utility

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Assignee

Inventors

Key dates

Filing dateApr 27, 1984
Grant dateApr 1, 1986
Priority date
Expiry dateApr 27, 2004

Classification

  • Technology area (CPC A)Human Necessities
  • CPC primaryA61P1/04
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

The invention relates to the new monohydrate of N-methyl-N'-{2-[(5-methylimidazol-4-yl)-methylthio]-ethyl}-N"-cyanoguanidi ne (cimetidine), a histamine-H.sub.2 receptor antagonist which is called N-methyl-N'-{2-[(5-methylimidazol-4-yl)-methylthio]-ethyl}-N"-cyanoguanidi ne H (cimetidine H) as well as to a process for the preparation of same, which comprises pouring a hot, homogeneous aqueous solution of N-methyl-N'-{2-[(5-methylimidazol-4-yl)-methylthio]-ethyl}-N"-cyanoguanidi ne, optionally containing also methylamine, onto ice and separating the N-methyl-N'-{2-[(5-methylimidazol-4-yl)-methylthio]-ethyl}-N"-cyanoguanidi ne monohydrate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.