Compounds, compositions and methods are provided which are useful in the treatment of diseases through the modulation of potassium ion flux through voltage-dependent potassium channels. More particularly, the invention provides sulfonamides, and compositions and methods utilizing sulfonamides that are useful in the treatment of diseases by blocking potassium channels associated with the onset or recurrence of the indicated conditions. Exemplary diseases treatable with the compounds, compositions and methods of the invention include sickle cell disease and glaucoma.