Compositions comprising glycosaminoglycans of low viscosity and use of said composition in therapy of chronic cystitis
The present invention concerns an aqueous pharmaceutical composition for bladder instillation, cystitis therapy, or interstitial cystitis therapy, the aqueous composition containing water, hyaluronic acid or a salt thereof and/or chondroitin sulphate or a salt thereof, and a pharmaceutically acceptable bivalent metal ion, wherein the bivalent metal ion is chosen from calcium and magnesium, and wherein the bivalent ion lowers the viscosity of the composition.
1. An aqueous pharmaceutical composition for bladder instillation, cystitis therapy, or interstitial cystitis therapy, the aqueous composition comprising water, hyaluronic acid or a salt thereof and/or chondroitin sulphate or a salt thereof, and a pharmaceutically acceptable bivalent metal ion, wherein the bivalent metal ion is chosen from calcium and magnesium, and wherein the bivalent metal ion is present in an amount effective to lower the viscosity of the composition.
2. Composition as claimed in claim 1 wherein the bivalent metal is a calcium ion.
3. Composition as claimed in claim 1 wherein from 0.05 to 10.0 equivalents of bivalent metal ions are present relative to the sum of the hyaluronic acid and chondroitin sulfate present.
4. Composition as claimed in claim 3 wherein from 0.5 to 2.0 equivalents of bivalent metal ions are present relative to the sum of the hyaluronic acid and chondroitin sulfate present.
5. Composition as claimed in claim 1 wherein the hyaluronic acid or a salt thereof is present in a concentration from 0.1% to 3% w/v and the chondroitin sulfate or a salt thereof is present in a concentration from 0.05% to 3% w/v.
6. Composition as claimed in claim 5 wherein the hyaluronic acid and the chondroitin sulfate or their salts are present at 1.6% and 2.0%, respectively, by weight/volume.
7. Composition as claimed in claim 1 , sterilized in an autoclave.
8. Composition as claimed in claim 3 wherein from 0.1 to 3.5 equivalents of bivalent metal ions are present relative to the sum of the hyaluronic acid and chondroitin sulfate present.
9. Composition as claimed in claim 4 wherein 1 equivalent of bivalent metal ions is present relative to the sum of the hyaluronic acid and chondroitin sulfate present.
10. Composition as claimed in claim 5 wherein the hyaluronic acid or a salt thereof is present in a concentration from 0.8% to 2.0% w/v, and the chondroitin sulfate or a salt thereof is present in a concentration from 0.1% to 2.5% w/v.