Potassium ste, tribasic, heptahydrate | H14K3O11P | CID 18430360 - structure, chemical names, sical and chemical properties, classification, patents. Potassium ste injection is a ste replacement that is used to treat or prevent hypostemia (low srus in the blood). It is also used as an additive in the preparation of fluid formula injections. This medicine is given to patients who cannot receive a ste supplement by mouth