ChEBI: Potassium chloride is a metal chloride salt with a K(+) counterion. It has a role as a fertilizer. It is a potassium salt and an inorganic chloride.NCI Thesaurus (NCIt): Potassium Chloride is a metal halide composed of potassium and chloride. Potassium maintains intracellular tonicity, is required for nerve conduction, cardiac, skeletal and smooth muscle contraction, production of energy, the synthesis of nucleic acids, maintenance of blood pressure and normal renal function. This agent has potential antihypertensive effects and when taken as a nutritional supplement may prevent hypokalemia. A metal chloride salt with a K(+) counterion.