Provided herein are methods of modulating bile acid homeostasis or treating a bile-acid related or associated disorder, comprising using variants and fusions of fibroblast growth factor 19 (FGF19), variants and fusions of fibroblast growth factor 21 (FGF21), fusions of FGF19 and/or FGF21, and variants or fusions of FGF19 and/or FGF21 proteins and peptide sequences (and peptidomimetics), in combination with agents effective in modulating bile acid homeostasis or treating a bile-acid related or associated disorder.