Pharmaceutical compositions that include inhibitors of mitochondrial fission are described for the treatment and/or mitigation of cancer, pulmonary arterial hypertension, cardioprotection, stroke, coronary heart disease, neurological disorder, a neurodegenerative disease, Parksinonism, Huntington's Chorea, Alzheimer's disease, diabetic cardiomyopathy, fatty liver diseases, non-alcoholic fatty liver diseases, or alcohol-related liver disease.