Compositions for colon lavage and methods of making and using same

Disclosed herein are compositions that include polyethylene glycol; alkali metal sulfate; electrolytes selected from the group consisting of sodium bicarbonate, sodium chloride, and potassium chloride or a mixture thereof; and a gastro-protected dye composition comprising a gastro-protectant and a dye suitable for use in an internal colon examination procedure. Also provided herein are sachets, and containers, e.g. sachets that include disclosed compositions; kits for colon cleansing, and aqueous solutions suitable for colon cleansing.