PROCESS FOR MANUFACTURING PHENYLEPHRINE RESINATE PARTICLES PHENYLEPHRINE RESINATE PARTICLES AND USE OF PHENYLEPHRINE RESINATE PARTICLES IN PHARMACEUTICAL FORMULATIONS

1 . A drug-resin complex comprising phenylephrine and a cation polystyrene sulfonate, wherein said cation polystyrene sulfonate comprises particle sizes of about 74 μm to about 177 μm prior to being combined with the phenylephrine, and wherein said drug resin complex comprises phenylephrine:resin in a ratio of greater than about 1:1.

2 . The drug-resin complex of claim 1 , wherein the cation is selected from the group consisting of sodium, copper, zinc, iron, calcium, strontium, magnesium and lithium.

3 . The drug-resin complex of claim 2 , wherein the cation is sodium.

4 . An extended release particle, wherein said extended release particle comprises the drug-resin complex of claim 3 coated with a coating.

5 . The extended release particle of claim 4 , wherein the coating comprises a cellulose material.

6 . The extended release particle of claim 5 , wherein the cellulose material is selected from the group consisting of cellulose acetate and hydroxypropylcellulose.

7 . A pharmaceutical formulation comprising the extended release particle of claim 6 .

8 . The pharmaceutical formulation of claim 7 , further comprising an immediate release form of phenylephrine.

9 . A method of forming a coated drug-resin complex, comprising coating the drug-resin complex of claim 1 .

10 . The drug-resin complex of claim 1 , wherein at least about 50% of the particles have particle sizes of about 74 μm to about 177 μm.

11 . The drug-resin complex of claim 10 , wherein at least about 80% of the particles have a particle sizes of about 74 μm to about 177 μm.

12 . The drug-resin complex of claim 11 , wherein at least about 90% of the particles have a particle sizes of about 74 μm to about 177 μm.

13 . The drug-resin complex of claim 1 , wherein less than 15% of the particles have a particle size less than about 44 μm.

14 . The drug resin complex of claim 1 , wherein said drug resin complex comprises phenylephrine:resin in a ratio of about 1.25:1.

15 . The drug resin complex of claim 1 , wherein said drug resin complex comprises phenylephrine:resin in a ratio of about 1.33:1.

16 . The drug resin complex of claim 1 , wherein said drug resin complex comprises phenylephrine:resin in a ratio of about 1.4:1.

17 . The drug resin complex of claim 1 , wherein said drug resin complex comprises phenylephrine:resin in a ratio of about 1.5:1

18 . The drug resin complex of claim 1 , wherein said drug resin complex comprises phenylephrine:resin in a ratio of about 1.6:1

19 . A process for preparing a drug-resin complex, comprising:

Step A:

mixing purified water and resin in a container to form a first mixture;

filtering the first mixture to form a wet cake containing resin;

rinsing the wet cake containing resin with purified water;

filtering the rinsed wet cake containing resin;

Step B:

mixing purified drug and water in a container to form a drug solution;

Step C:

mixing the filtered wet cake containing resin and a portion of the drug solution in a container to form a second mixture;

filtering the second mixture to form a first loaded resinate;

Step D:

mixing the first loaded resinate and a portion of the drug solution in a container to form a third mixture;

filtering the third mixture to form a second loaded resinate;

Step E:

optionally, repeating step D multiple times; and

Step F:

drying the loaded resinate to form the drug-resin complex.

20 . The process of claim 19 , wherein the drug is phenylephrine.

21 . The process of claim 20 , wherein the resin is a cation polystyrene sulfonate.

22 . The process of claim 21 , wherein the cation polystyrene sulfonate comprises particle sizes of about 74 μm to about 177 μm prior to being combined with the phenylephrine.

23 . The process of claim 22 , wherein the drug resin complex comprises phenylephrine:resin in a ratio of greater than about 1:1

24 . The process of claim 23 , wherein the drug resin complex comprises phenylephrine:resin in a ratio of about 1.4:1