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Methods for the preparation of polymorphs of doxazosin mesylate

  • US 6,399,775 B1
  • Filed: 07/13/2000
  • Issued: 06/04/2002
  • Est. Priority Date: 07/13/2000
  • Status: Expired due to Term
First Claim
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1. A method for the preparation of Form D of doxazosin mesylate which comprises:

  • (a) dissolving doxazosin base and methane sulfonic acid in an alcohol having from 1 to 8 carbon atoms;

    (b) precipitating Form D of doxazosin mesylate from the resulting solution; and

    (c) separating the Form D of doxazosin mesylate.

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