Dosage forms comprising polymers comprising different molecular weights
First Claim
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1. A method for administering a drug to the gastrointestinal tract of a patient, which method comprises,(a) admitting a dosage form orally into a patient, said dosage form comprising:
- (1) a first layer comprising 10 ng to 750 mg of drug;
(2) a second layer for pushing the first layer from the dosage form;
(3) a wall surrounding the first and second layers, the wall comprising at least in part, a composition permeable to the passage of fluid;
(4) an exit passageway in the wall for delivering the drug from the dosage form to the patient; and
wherein said,(5) first layer comprises an alkali carboxymethylcellulose comprising a 10,000 to 300,000 molecular weight; and
said,(6) second layer comprises an alkali carboxymethylcellulose comprising a molecular weight greater than 300,000; and
wherein the dosage form when in use is characterized by said;
(7) first layer possessing an initial flow-resistant that is changed in the presence of imbibed fluid into a dispensable aqueous drug layer; and
said;
(8) second layer pushing the first layer through the exit passageway, with each alkali carboxymethylcellulose maintaining its original separate identities and functions;
thereby,(b) administering the drug by the first and second layers cooperating to administer substantially all the drug to the patient over time.
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Abstract
A dosage form is disclosed comprising a wall surrounding a compartment, which comprises a first composition comprising a carboxymethylcellulose and a second composition comprising a higher molecular weigh carboxymethylcellulose. The first composition comprises a dosage amount of drug that delivers from the dosage form at a controlled rate over time.
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Citations
7 Claims
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1. A method for administering a drug to the gastrointestinal tract of a patient, which method comprises,
(a) admitting a dosage form orally into a patient, said dosage form comprising: -
(1) a first layer comprising 10 ng to 750 mg of drug; (2) a second layer for pushing the first layer from the dosage form; (3) a wall surrounding the first and second layers, the wall comprising at least in part, a composition permeable to the passage of fluid; (4) an exit passageway in the wall for delivering the drug from the dosage form to the patient; and
wherein said,(5) first layer comprises an alkali carboxymethylcellulose comprising a 10,000 to 300,000 molecular weight; and
said,(6) second layer comprises an alkali carboxymethylcellulose comprising a molecular weight greater than 300,000; and
wherein the dosage form when in use is characterized by said;(7) first layer possessing an initial flow-resistant that is changed in the presence of imbibed fluid into a dispensable aqueous drug layer; and
said;(8) second layer pushing the first layer through the exit passageway, with each alkali carboxymethylcellulose maintaining its original separate identities and functions;
thereby,(b) administering the drug by the first and second layers cooperating to administer substantially all the drug to the patient over time. - View Dependent Claims (4, 5, 6, 7)
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2. The method for administering a drug to the gastrointestinal tract of a patient wherein the method comprises:
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(a) admitting a dosage form orally into the patient, said dosage form comprising; (1) a first composition comprising 10 ng to 750 mg of a drug selected from the group consisting of nifedipine, verapamil, diltiazem, bepridil, nicardipine, nitredipine, isradipine, and niludepine; (2) a second composition for pushing the first composition from the dosage form; (3) a wall surrounding the first and second compositions, the wall comprising at least in part, a composition permeable to the passage of fluid; (4) an exit passageway in the wall for delivering the drug from the dosage form to the patient; and
wherein said,(5) first composition comprises a member selected from the group consisting of a potassium and sodium carboxymethylcellulose comprising a 10,000 to 300,000 molecular weight; and
said,(6) second composition comprises a member selected from the group consisting of a potassium and sodium carboxymethylcellulose comprising a molecular weight greater than 300,000; and
,(b) administering the drug by the first and second composition cooperating to administer substantially all the drug to the patient over time. - View Dependent Claims (3)
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Specification