Carvedilol-galenics
The invention relates to a process for the preparation of fast-dissolving pharmaceutical preparations from difficultly soluble active substances, wherein an aqueous suspension is made from the active substance and one or more water-soluble adjuvants and then the resulting aqueous suspension is processed, with removal of the water, by methods conventional per se, to form solid pharmaceutical preparations. The invention also relates to fast-dissolving pharmaceutical preparations of active substances having a dissolution rate of at least 70% after 30 minutes, prepared in accordance with the process of the invention.
1. A process for preparing a pharmaceutical preparation comprising carvedilol or 4-[2-hydroxy-3-[4-(phenoxymethyl)piperidino]-propoxy]-indole and one or more water-soluble adjuvants, wherein the pharmaceutical preparation has a dissolution rate of at least 70% after 30 minutes, comprising (a) making an aqueous suspension from the carvedilol or 4-[2-hydroxy-3-[4-(phenoxymethyl)piperidino]-propoxy]-indole and one or more water-soluble adjuvants, and (b) spray drying the resulting aqueous suspension, with removal of water, to form a solid pharmaceutical preparation.
2. A process according to claim 1 , wherein the active substance has a particle diameter of less than 500 μm.
3. A process according to claim 2 , wherein the active substance has a particle diameter of less than 250 μm.
4. A process according to claim 3 , wherein the active substance has a particle diameter of less than 100 μm.
5. A process according to claim 1 , wherein the one or more water-soluble adjuvants are binders, fillers, disintegrating agents and/or surfactants.
6. A process according to claim 1 , wherein the ratio of active substance to adjuvant in the dry substance in the suspension is 1:0.0 to 1:500.
7. A process according to claim 6 , wherein the ratio of active substance to adjuvant in the dry substance in the suspension is 1:0.1 to 1:50.
8. A process according to claim 1 , further comprising adding a surfactant to the aqueous suspension, wherein the ratio of active substance to surfactant is in the range of up to 1:1.
9. A process according to claim 8 , wherein the ratio of active substance to surfactant is in the range of up to 1:0.3.
10. A process according to claim 8 , further comprising dissolving a surfactant in water and then admixing the active substance together with one or more adjuvants.
11. A process according to claim 1 , further comprising admixing a water-insoluble excipient in the aqueous suspension or applying he suspension to the excipient.
12. A process according to claim 11 , further comprising stirring the active substance together with the water-insoluble excipient into an aqueous adjuvant solution, if required together with other water-soluble adjuvants.
13. A process according to claim 12 , wherein the water-insoluble excipient is highly dispersed silicon dioxide or aluminum oxide.
14. A process according to claim 1 , comprising making a solid pharmaceutical preparation by spray solidification from the active substance suspended in meltable adjuvants.