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RESULTS AND DISCUSSION: It was hypothesized that a polymeric “shield” of Eudragit RS in the composition of diltiazem-loaded porous microspheres and/or the enhanced viscosity achieved by the addition of high-molecular gelling agent Poloxamer 407 to an aqueous drug dispersion will benefit the drug’s stability. Instead, a negative effect on the hydrolysis rate was found to be dominant for both polymers, likely due to an “unfavorable” shift in the dielectric conductivity of the media and/or suspected catalytic effect of quaternary ammonium groups of Eudragit RS.

scripta scientifica pharmaceutica

Hydrolytic stability of diltiazem in the presence of chosen polymers - Poloxamer 407 and Ammonio Metacrylate Copolymer Type B (Eudragit RS): а preliminary study