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Generated: September 23, 2017

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Title:Buffer solutions having selective bactericidal activity against gram negative bacteria and methods of using same
Abstract: Buffer solutions for pharmaceutical preparations that have bactericidal activity preferentially against gram negative bacteria are provided. The buffers have a pH of greater than about 10 or less than about 4.5 with low buffer capacity. Methods of their use in reducing the occurrence of blood stream infections in a mammal is also provided.
Inventor(s): Jeffs; Roger Andrew (Chapel Hill, NC), Zaccardelli; David (Cary, NC)
Assignee: United Therapeutics Corporation (Silve Spring, MD)
Filing Date:Jan 17, 2014
Application Number:14/158,091
Claims:1. A method of reducing occurrence of a bacterial infection in a human in need of treprostinil, comprising diluting a starting solution comprising the treprostinil with a buffer comprising glycine and having a pH of greater than 10 to provide a final solution comprising the treprostinil with a pH of greater than 10 and administering the final solution to the human in need thereof.

2. The method of claim 1, wherein the administering is by injection.

3. The method of claim 2, wherein the injection is intravenous injection.

4. The method of claim 1, wherein the buffer further comprises sodium hydroxide.

5. The method of claim 1, wherein the buffer has a pH between 10 and 12.

6. The method of claim 5, wherein the buffer has a pH between 10.2 and 10.8.

7. The method of claim 6, wherein the final solution is administered intravenously.

8. The method of claim 1, wherein the final solution is administered at a concentration of the treprostinil between about 0.001 mg/mL to about 1 mg/mL.

9. The method of claim 8, wherein the final solution is administered at a concentration of the treprostinil between about 0.004 mg/mL to about 0.13 mg/mL.

10. The method according to claim 1, wherein the administration reduces the growth of gram negative bacteria.

11. The method of claim 1, wherein the buffer is a 50 mL solution of 94 mg of glycine, 73.3 mg of sodium chloride, and sodium hydroxide.

12. The method of claim 11, wherein the administering is by injection.

13. The method of claim 12, wherein the injection is intravenous injection.

14. The method of claim 1, wherein the treprostinil is treprostinil sodium.
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Harvard Business School
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Fish and Richardson
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