Studies on gynaecological hydrophilic lactic acid preparations. Part 5: The use of Eudragit E-100 as lactic acid carrier in intravaginal tablets.

Intravaginal tablets based on hydrophilic methylcellulose and containing lactic acid complexed with Eudragit E-100 undergo deformation under standard conditions. The high flow--limit of gel originating from the tablets as well as its dynamic viscosity should enable durability of this dosage form on the vaginal mucosa. By selecting either 1 : 1 or 2 : 1 ratios of lactic acid to Eudragit E-100 it is possible to obtain tablets that disintegrate into a gelform at pH 3.8-4.4, i.e. the pH remains within the physiological range. Increasing the amount of lactic acid in the complex in relation to the polymer to a 4:1 ratio results in gels with a lower pH while possessing an acid reserve that can neutralize the excess of alkali present in severe vaginal infections.