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The rapid release from a double-compressed tablet containing theophylline with the water-soluble polymer, hydroxypropylmethylcellulose (HPMC) or hydroxypropylmethylcellulose phthalate (HPMCP), used as a wall material can be suppressed by argon plasma-irradiation and changed into the sustained-release system due to a decrease in solubility of the outer layer. It was shown that the release profiles can be varied so as to cause theophylline release at different rates, depending on the set of conditions chosen for tablet manufacture and for plasma operation.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

A New Drug Delivery System Using Plasma-Irradiated Pharmaceutical Aids. IX. Controlled-Release of Theophylline from Double-Compressed Tablet Composed of Cellulose Derivatives as Wall Material.