Erythromycin has the properties of a macrolide derivative antibiotic, but erythromycin has the disadvantage that it is not soluble in water. One way to increase the solubility of erythromycin is through a solid dispersion system. The solid dispersion that has been made is then formulated into a gel preparation with the aim of inserting erythromycin through the skin pores. The gel base used is H…