Patients w/ colostomy. Ca, phosphate, K & Na level should be closely monitored. Patients w/ impaired renal function. Oral soln: Receiving low salt diet. Patients w/ heart disease, MI, unstable angina, pre-existing electrolyte disturbances, receiving drugs that prolong QT interval, ulcerative colitis, DM, reflux esophagitis, swallowing reflex disorders, unconsciousness, any conditions that allow regurgitation. Pregnancy & lactation. Elderly. Debilitated patients. Enema: Patients who are suffering congenital megacolon, intestinal obstruction, anal imperforation, or CHF. In patients taking diuretics or other drugs that can affect electrolyte levels in the body. Childn <12 yr.