Dipyricamole sustained release forms comprising lacquer-coated particles and the preparation thereof
First Claim
1. A composition for the sustained release of dipyridamole which comprises (i) spheroid particles comprised of (a) dipyridamole or acid addition salts thereof and (b) at least one pharmacologically acceptable acid or acid substance, the total amount of acid from acid addition salts present and the acid or acid substance being in a ratio of at least 1 acid equivalent to 1 mol of dipyridamole, said particles having a diameter of from about 0.1 to 3 mm, and (ii) a coating surrounding said spheroid particles, said coating being comprised of from about 50 to 100 percent by weight of acid-insoluble lacquers soluble in intestinal juices and from about 0 to 50 percent by weight of lacquers insoluble in gastric and intestinal juices and said coating being present in an amount of from about 3 to 30 percent by weight, based on the weight of the spheroid particles.
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Accused Products
Abstract
This invention relates to a composition for the sustained release of dipyridamole which comprises (i) spheroid particles comprised of dipyridamole or crystallized salts thereof and pharmacologically acceptable acid or acid substance, and (ii) a coating surrounding said spheroid particles, said coating being comprised of from about 50 to 100 percent by weight of acid-insoluble lacquers soluble in intestinal juices and from about 0 to 50 percent by weight of lacquers insoluble in gastric and intestinal juices and said coating being present in an amount of from about 3 to 30 percent by weight, based on the weight of the spheroid particles, and to the preparation of such a composition.
137 Citations
39 Claims
- 1. A composition for the sustained release of dipyridamole which comprises (i) spheroid particles comprised of (a) dipyridamole or acid addition salts thereof and (b) at least one pharmacologically acceptable acid or acid substance, the total amount of acid from acid addition salts present and the acid or acid substance being in a ratio of at least 1 acid equivalent to 1 mol of dipyridamole, said particles having a diameter of from about 0.1 to 3 mm, and (ii) a coating surrounding said spheroid particles, said coating being comprised of from about 50 to 100 percent by weight of acid-insoluble lacquers soluble in intestinal juices and from about 0 to 50 percent by weight of lacquers insoluble in gastric and intestinal juices and said coating being present in an amount of from about 3 to 30 percent by weight, based on the weight of the spheroid particles.
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39. A process for the preparation of a sustained release dipyridamole composition which comprises the steps of:
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(a) uniformly spraying rounded starter cores having an average diameter of from about 0.3 to 1 mm with an alcoholic polyvinyl pyrrolidone solution; (b) mixing the sprayed starter cores from step (a) with a mixture of dipyridamole or acid addition salts thereof and a sufficient amount of acid substance to make the dipyridamole component water-soluble until the starter cores thus treated roll freely; (c) drying the treated cores from step (b), steps (a) to (c) being repeated until the treated cores obtain a size of from about 0.1 to 3 mm; and (d) applying to the treated cores from step (c) a lacquer coating comprising from about 50 to 100 percent by weight of pharmacologically acceptable acid-insoluble lacquers soluble in intestinal juices and from 0 to about 50 percent by weight of pharmacologically acceptable lacquers insoluble in gastric and intestinal juices, said coating being present in an amount of from about 3 to 30 percent by weight, based on the weight of the spheroid particles.
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Specification