Disclosed is a medicinal cream that includes flisidic acid which is made in situ under an oxygen-free environment using sodium fusidate. The fusidic acid is made by dissolving the sodium fusidate in a co-solvent under inert gas purging and under vacuum, and converting the sodium fusidate to fusidic acid in situ by adding an acid under stirring, The disclosed medicinal cream also includes a biopolymer and a cream base comprising at least one of each of a primary and secondary emulsifier, a waxy material, and water.
