Formulations providing three distinct releases
AssigneeAmerican Home Products Corporation
InventorsAtul M. Mehta, Lizbeth A. Bachand, Thomas W. Leonard, Ronald N. Warner
Life of this patent
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Abstract
A therapeutic preparation consisting of three groups of spheroids containing an active medicinal substance. The first group of spheroids is uncoated and rapidly disintegrates upon ingestion to release an initial dose of medicinal substance a second group of spheroids is coated with a pH sensitive coat to provide a second dose and a third group of spheroids is coated with a pH independent coat to provide a third dose. A powder blend of active medicinal substance may be substituted for the first group of uncoated spheroids. The therapeutic preparation may be utilized as a mixture of groups of spheroids in a capsule.
Claims8
A therapeutic composition for oral administration consisting essentially of a pharmaceutical gelatin capsule containing film coated spheroids, which spheroids prior to coating comprise 10% to 60% by weight of an vinpocetine in admixture with non-water swellable microcrystalline cellulose, and said film coating comprising (i) an undercoat selected from the group consisting of hydroxypropyl methylcellulose and hydroxypropyl methylcellulose containing as a disintegrant carboxymethylcellulose sodium or sodium starch glycolate and (ii) an overcoat consisting of a copolymer based on polymethyacrylic acid esters containing metalic stearates.
A therapeutic composition for once daily oral administration consisting essentially of a pharmaceutical gelatin capsule containing a powder blend of vinpocetine and two groups of coated spheroids each also containing vinpocetine wherein:
- (a) said powder blend comprises 10% to 50% by weight of vinpocetine in admixture with pharmaceutical excipients for immediate release of vinpocetine to provide a loading dose of vinpocetine,
- (b) said first group of spheroids comprises film coated spheroids, which spheroids prior to coating comprise 20% to 75% by weight of vinpocetine in admixture with non-water swellable cellulose, said film coating comprising (i) a copolymer based on methacrylic acid and methacrylic acid methyl ester or (ii) polyvinyl acetate phthalate, said first group of film coated spheroids having a pH sensitive coating to provide a delayed second dose of vinpocetine, and
- (c) said second group of spheroids comprises film coated spheroids, which spheroids prior to coating comprise 10% to 60% by weight of vinpocetine in admixture with non-water swellable microcrystalline cellulose, and said film coating comprising (i) an undercoat selected from the group consisting of hydroxypropyl methylcellulose and hydroxypropyl methylcellulose containing as a disintegrant carboxymethylcellulose sodium or sodium starch glycolate and (ii) an overcoat consisting of a neutral copolymer based on polymethacrylic acid esters containing metallic stearates, said second group of film coated spheroids being double coated with an effective thickness to provide a further delayed third dose of vinpocetine.
A therapeutic composition for once daily oral administration consisting essentially of a pharmaceutical gelatin capsule containing three groups of spheroids each containing vinpocetine wherein:
- (a) said first group of spheroids comprises 10% to 50% by weight of vinpocetine in admixture with non-water swellable microcrystalline cellulose for immediate release of vinpocetine to provide a loading dose of vinpocetine,
- (b) said second group of spheroids comprises film coated spheroids, which spheroids prior to coating comprise 10% to 60% by weight of vinpocetine in admixture with non-water swellable cellulose, said film coating comprising (i) a copolymer based on methacrylic acid and methacryclic acid methyl ester or (ii) polyvinyl acetate phthalate, said first group of film coated spheroids having a pH sensitive coating to provide a delayed second dose of vinpocetine, and
- (c) said third group of spheroids comprises film coated spheroids, which spheroids prior to coating comprise 40% to 65% by weight of vinpocetine in admixture with non-water swellable microcrystalline cellulose and said film coating comprising (i) an undercoat selected from the group consisting of hydroxypropyl methylcellulose and hydroxypropyl methylcellulose containing as a disintegrant carboxymethylcellulose sodium or sodium starch glycolate and (ii) an overcoat consisting of a neutral copolymer based on polymethacrylic acid esters containing metallic stearates, said second group of film coated spheroids being double coated with an effective thickness to provide a further delayed third dose of vinpocetine.
Dependencies are inferred from the claim text.