Disclosed is infusion for mastitis which contains a main ingredient, medium-chain fatty acid monoglyceride and an oily base wherein diffusivity and dispersivity of the main ingredient are improved by the monoglyceride to enhance dissolubility and thus absorbency of the main ingredient. In comparison with conventional infusions for mastitis, the infusion has immediate effectivity and is short in residual term； the main ingredient is expected to be utilized effectively and without waste.
