Compositions and kits comprising a tyrosine hydroxylase inhibitor and an anticancer agent that is chemically bonded to, or physically associated with, the tyrosine hydroxylase inhibitor are provided. Also provided are methods for reducing cell proliferation in a subject comprising administering to a subject in need thereof a composition comprising a tyrosine hydroxylase inhibitor and an anticancer agent that is chemically bonded to, or physically associated with, the tyrosine hydroxylase inhibitor.