Prolonged release pharmaceutical preparations
AssigneePennwalt Corporation
InventorYegnaswami Raghunathan
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Abstract
Prolonged release pharmaceutical preparations containing ion exchange resin drug complexes at least a substantial portion of which have been treated with a solvating agent and provided with a diffusion barrier coating.
Claims8
A pharmaceutical preparation comprising ion exchange resin particles having a pharmacologically active drug absorbed thereon to form drug-resin complex particles, which resin particles have been treated in an amount sufficient to retard their rate of swelling in water with an impregnating agent selected from the group consisting of polyethylene glycol, propylene glycol, mannitol, lactose and methylcellulose, and which treated particles have been subsequently coated with a water-permeable diffusion barrier.
Dependencies are inferred from the claim text.