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Details for Patent: 5,770,230

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Details for Patent: 5,770,230

Title: Method for preparing stabilized prostaglandin E1
Abstract:A stable and lyophilized formulation of prostaglandin E-1 made by the process comprising a) dissolving PGE-1 in a solution of lactose and tertiary butyl alcohol wherein said tertiary butyl alcohol is present in an amount of from about 15% to about 33% volume/volume and the ratio of said lactose to PGE-1 is from about 40,000 to 1 to about 10,000 to 1 weight/weight whereby a formulation of PGE-1 dispersed in lactose is formed; b) adjusting and maintaining the pH of said formulation from about 3.5 to about 6 with an organic acid buffer, c) freezing said formulation to about -50.degree. C.; and d) drying said formulation to obtain a moisture content of less than 1% by dry weight and a tertiary butyl alcohol content of less than 3% by dry weight. Preferably, step c) includes after freezing said formulation to about -50.degree. C., warming to about -25.degree. C. for about 2 hours then refreezing to about -50.degree. C. Preferably, the prostaglandin is in an amount of about 25 to 100 ppm in lactose and the pH is maintained at about 4 to 5.
Inventor(s): Teagarden; Dirk L. (Kalamazoo, MI), Petre; William J. (Kalamazoo, MI), Gold; Paul M. (Vicksburg, MI)
Assignee: Pharmacia & Upjohn Company (Kalamazoo, MI)
Filing Date:Dec 30, 1996
Application Number:08/777,132
Claims:1. A method for preparing a stabilized, lyophilized formulation of PGE-1 comprising the steps of:

a) adding PGE-1 to lactose and tertiary butyl alcohol wherein said tertiary butyl alcohol is present in an amount of from about 15% to about 33% volume/volume and the ratio of said lactose to PGE-1 is from about 40,000 to 1 to about 10,000 to 1 weight/weight whereby a formulation of PGE-1 dispersed in lactose is formed;

b) adjusting the pH of said formulation from about 4 to about 5 with an organic acid buffer selected from the group consisting of citrate and acetate;

c) freezing said formulation to about -50.degree. C., warming to about -25.degree. c. for about two hours and then refreezint to about -50.degree. C.; and

d) drying said formulation to obtain a moisture content of less than 1% by dry weight and a tertiary butyl alcohol content of less than 3% by dry weight.

2. The method of claim 1 wherein in said organic acid buffer of step b) is sodium citrate.

3. The method of claim 1 wherein in PGE-1 is in an amount of about 25 to about 100 ppm in lactose.
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