Stable therapeutic formulations
Compositions of and methods for formulating and delivering biologically active agent formulations having enhanced physical stability, and wherein deterioration from the presence of oxygen and/or water is minimized and/or controlled, to yield a stable formulation. The compositions of and methods for formulating and delivering biologically active agents of the present invention further facilitate their incorporation into a biocompatible coating which can be employed to coat a stratum-corneum piercing microprojection, or a plurality of stratum-corneum piercing microprojections of a delivery device, for delivery of the biocompatible coating through the skin of a subject, thus providing an effective means of delivering the biologically active agents.
1. A method for manufacturing a transdermal delivery device, wherein said transdermal delivery device comprises a microprojection member comprising a coated array, and adhesive backing and a retainer ring; wherein the method comprises the following steps:
(i) providing a microprojection member having a plurality of microprojections, an adhesive backing and a retainer ring;
(ii) providing a biocompatible coating formulation comprising a biologically active agent, wherein the biologically active agent comprises hPTH or hPTH(1-34);
(iii) coating the microprojection member with the biocompatible coating formulation to form said transdermal delivery device; and
(iv) packaging said transdermal delivery device by heat sealing said transdermal delivery device in a foil pouch purged with nitrogen gas to form a dry inert atmosphere,
wherein the step of coating further comprises depositing the biocompatible coating formulation in the range of 10 to 200 picoliters per microprojection or 0.1 to 20 nanoliters per microprojection,
wherein said method further comprises pre-drying the retainer ring to effectively remove desorbed oxygen and moisture from the ring prior to pouching.
2. The method of claim 1 , wherein packaging the transdermal delivery device comprises providing a desiccant.
3. The method of claim 2 , wherein the desiccant comprises calcium oxide, clay desiccant, calcium sulfate, silica gel or a mixture thereof.
4. The method of claim 1 , wherein the dry inert atmosphere comprises carbon dioxide.
5. The method of claim 1 , wherein the dry inert atmosphere comprises argon, helium, neon, krypton, or a mixture thereof.
6. The method of claim 1 , wherein the dry inert atmosphere has essentially zero water content.
7. The method of claim 1 , further comprising providing a purge device to reduce moisture or oxygen content during packaging.
8. The method of claim 1 , wherein packaging said transdermal delivery device is carried out under partial vacuum.
9. The method of claim 1 , wherein packaging comprises providing a foil-lined chamber.
10. The method of claim 9 , wherein said transdermal delivery device is enclosed in said foil-lined chamber.
11. The method of claim 9 , wherein the chamber comprises a foil lid, and a desiccant and/or oxygen absorber is attached to the foil lid wherein said chamber is sealed by the foil lid.
12. The method of claim 11 , wherein and the chamber is purged with dry nitrogen prior to sealing the chamber.
13. The method of claim 1 , wherein the biologically active agent comprises HPTH.
14. The method of claim 1 , wherein said packaging comprises adding a desiccant to the pouch.
15. The method of claim 14 , wherein the desiccant comprises a 4 Å molecular sieve desiccant.
16. The method of claim 15 , wherein said pouch is a foil pouch, said desiccant comprises 3.5 g molecular sieves packaged in sachets and 125 mg adhesive labels affixed to-inside walls of the foil pouch.
17. The method of claim 1 , wherein said packaging comprises sterilizing said transdermal delivery device.
18. The method of claim 17 , wherein said sterilizing comprises subjecting said transdermal delivery device to e-beam treatment.
19. The method of claim 1 , wherein the biologically active agent further comprises one or more counterions to further improve the stability of the formulation.
20. The method of claim 19 , wherein the one or more counterions is selected from the group consisting of acetate, propionate, butyrate, pentanoate, hexanoate, heptanoate, levulinate, chloride, bromide, citrate, succinate, maleate, glycolate, gluconate, glucuronate, 3-hydroxyisobutyrate, 2-hydroxyisobutyrate, lactate, malate, pyruvate, fumarate, tartarate, tartronate, nitrate, phosphate, benzene sulfonate, methane sulfonate, sulfate, sulfonate, sodium, potassium, calcium, magnesium, ammonium, monoethanolamine, diethanolamine, triethanolamine, tromethamine, lysine, histidine, arginine, morpholine, methylglucamine, and glucosamine.
21. The method of claim 14 , wherein the desiccant comprises a 3 Å molecular sieve desiccant.