Drospirenone-containing preparations for transdermal use
First Claim
1. A pharmaceutical preparation for application to skin, said pharmaceutical preparation containing solvent ingredients and drospirenone, said drospirenone being present in the preparation in an amount such that a saturation solubility of the drospirenone is not exceed in the preparation in an initial state of the preparation prior to application of the preparation to the skin, but wherein said drospirenone is present in the preparation in other amounts such that the saturation solubility of the drospirenone is exceeded after application of the preparation to the skin because of escape or discharge of the solvent ingredients from the preparation.
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Accused Products
Abstract
The pharmaceutical preparation for transdermal administration contains solvent ingredients, such as water and ethanol and/or propanol, and drospirenone. The drospirenone is contained in the preparation in an amount that is not above its saturation solubility in an initial state prior to application to skin. However after application to the skin the amount of drospirenone exceeds its saturation solubility due to escape or discharge of the solvent ingredients from the preparation. Preferably the saturation solubility is exceeded by at least a factor of five during application to the skin. The pharmaceutical preparation can also contain an estrogen, such as ethinyl estradiol. It can be in the form of a semi-solid or liquid preparation that is contained in a reservoir-type transdermal patch. A transdermal patch for contraception containing the pharmaceutical preparation including drospirenone and ethinyl estradiol is also disclosed.
61 Citations
24 Claims
- 1. A pharmaceutical preparation for application to skin, said pharmaceutical preparation containing solvent ingredients and drospirenone, said drospirenone being present in the preparation in an amount such that a saturation solubility of the drospirenone is not exceed in the preparation in an initial state of the preparation prior to application of the preparation to the skin, but wherein said drospirenone is present in the preparation in other amounts such that the saturation solubility of the drospirenone is exceeded after application of the preparation to the skin because of escape or discharge of the solvent ingredients from the preparation.
- 20. A reservoir-type transdermal patch for contraception, said reservoir-type transdermal patch comprising a pharmaceutical preparation for transdermal administration, wherein said pharmaceutical preparation contains solvent ingredients and drospirenone, and said drospirenone is present in the preparation in an amount such that a saturation solubility of the drospirenone is not exceed in the preparation in an initial state of the preparation prior to application to the skin, but wherein said drospirenone is present in the preparation in other amounts such that the saturation solubility of the drospirenone is exceeded after application to the skin because of escape or discharge of the solvent ingredients from the preparation.
Specification