A method for preparing an aqueous solution containing triterpenic acid, an aqueous solution containing triterpenic acid, and use thereof, includes preparation of a basic aqueous solution containing triterpenic acid and reduction of the pH of the basic aqueous solution containing triterpenic acid by adding an acidic aqueous solution in the presence of a stabilizing additive. The system may also provide an aqueous physiological solution of a plant extract containing triterpenic acid, a method for preparing same, and use thereof for therapeutic purposes that includes aqueous physiological solutions rich in triterpenic acid which includes pharmacologically effective amounts of triterpenic acids.