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  • Title: [Release of diltiazem chloride and ibuprofen from hydrophilic matrix tablets].
    Author: Vostalová L, Rabisková M, Medvecká G.
    Journal: Ceska Slov Farm; 2003 Nov; 52(6):295-8. PubMed ID: 14661369.
    Abstract:
    Hydrophilic matrix tablets based on hydroxypropylmethylcellulose (HPMC) and other cellulose derivatives rank among dosage forms with retarded effect widely used in contemporary pharmacotherapy. The active ingredient is released from them in dependence on its properties either by dissolution and diffusion, or erosion of the compact. The dissolution profile of the active ingredient can be influenced by variables of formulation and manufacture, e.g. by the type of HPMC employed, its concentration, other added auxiliary substances, and compression force which is reflected in the strength of tablets. Two drugs with different solubility were used to study the effect of drug solubility on its release from matrices: well soluble diltiazemium chloride and badly soluble ibuprofen. Higher solubility of the drug and lower solubility of compacts resulted in more rapid release of the active ingredient. Also lower concentration of HPMC accelerates the release of both drugs. The effect of the degree of viscosity of the polymer on drug release was not markedly manifested.
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