Methods of treatment for Crohn's disease and multiple sclerosis are disclosed. Also disclosed are methods for repositioning a pharmaceutical by selecting at least one target gene, gene product, or loci associated with the treatment of at least one first disease, trait, or phenotype by the pharmaceutical, identifying at least one second disease, trait, or phenotype associated with the least one target gene, gene product, or loci using genome-wide associated studies, and selecting at least one identified second disease, trait and/or phenotype based on step for treatment with the pharmaceutical.