The present invention provides crystalline forms, solvates and hydrates of 4-amino-2-butoxy-8-(3-(pyrrolidin-1-ylmethyl)benzyl)-7,8-dihydr opteridin-6(5H)-one, and methods of making.La presente invención proporciona formas cristalinas, solvatos e hidratos de 4-amino-2-butoxi-8-(3-pirrolidin-1-ilmetil)bencil)-7,8 -dihidropteridin-6(5H)-ona y métodos de elaboración.