Solvent system of hardly soluble drug with improved dissolution rate
First Claim
1. A pharmaceutical preparation comprising a hardly soluble acidic drug and a solvent system therefor, in which the solvent system comprises a pharmaceutically acceptable cation acceptance, 10 to 90% by weight of polyethylene glycol, 0.1 to 15% by weight of water and 0.1 to 50% by weight of a surfactant having an HLB value of 3 to 40 to improve the dissolution rate of the drug, and the said pharmaceutically acceptable cation acceptance increases solubility of the drug by partially ionize the hardly soluble acidic drug so that the drug exists in both forms of a free acid and a cationic salt, and is contained in an amount of 0.1 to 2 mole equivalent per mole of acidic groups in the acidic drug.
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Abstract
The present invention relates to a solvent system with improved disintegration degree and dissolution ratio of a hardly soluble drug by highly concentrating the drug through partial ionization, and by establishing optimal conditions for enhancing bioavailability of the drug, such as the co-relation between the acid drug and the accompanied components, ionization degree of a solvent system, use of an appropriate cation acceptance, water content, selection of optimal mixing ratio of the respective components and use of specific surfactants, and to a pharmaceutical preparation comprising the same. The solvent system of the invention has advantages in that it can enhance bioavailability by improving the disintegration degree and dissolution ratio of a hardly soluble drug and also provide a capsule with a sufficiently small volume to permit easy swallowing.
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Citations
13 Claims
- 1. A pharmaceutical preparation comprising a hardly soluble acidic drug and a solvent system therefor, in which the solvent system comprises a pharmaceutically acceptable cation acceptance, 10 to 90% by weight of polyethylene glycol, 0.1 to 15% by weight of water and 0.1 to 50% by weight of a surfactant having an HLB value of 3 to 40 to improve the dissolution rate of the drug, and the said pharmaceutically acceptable cation acceptance increases solubility of the drug by partially ionize the hardly soluble acidic drug so that the drug exists in both forms of a free acid and a cationic salt, and is contained in an amount of 0.1 to 2 mole equivalent per mole of acidic groups in the acidic drug.
Specification