A method of making a water-soluble doxorubicin-theanine cocrystal composition. The method includes the steps of providing a quantity of doxorubicin, adding a quantity of a theanine enantiomer to the quantity of doxorubicin to form a mixture of the quantity of doxorubicin and the enantiomer of theanine, wetting the mixture, and grinding the mixture for a length of time sufficient to produce a dried crystalline mass.
