Methods for the preparation of polymorphs of doxazosin mesylate
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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Abstract
Form D of doxazosin mesylate and a process for preparing Form D of doxazosin mesylate is described. The process is (a) dissolving doxazosin base and methane sulfonic acid in an alcohol having 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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Citations
2 Claims
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1. A method for the preparation of Form D of doxazosin mesylate which comprises:
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(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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2. Form D of doxazosin mesylate have X ray diffraction (28) values 5.7, 17.1, 17.8, 18.4, 20.8, 24.3, 26.6.
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Current AssigneeDr. Reddy's Laboratories Ltd.
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Original AssigneeDr. Reddy's Laboratories Ltd.
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InventorsReddy, Reguri Buchi, Giridhar, Thota, Ramesh, Chakka
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Primary Examiner(s)Berch, Mark L.
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Assistant Examiner(s)HABTE, KAHSAY
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Application NumberUS09/615,241Time in Patent Office691 DaysField of Search544/291US Class Current544/291CPC Class CodesC07D 405/12 linked by a chain containin...
