Hypersensitivity. Patients w/ hyperkalemia or conditions predisposing to hyperkalemia eg, chronic renal failure, uncontrolled DM, familial hyperkalemic periodic paralysis, acute dehydration, strenuous physical exercise in unconditioned individuals, adrenal insufficiency, extensive tissue breakdown, severe myocardial damage, administration of K-sparing diuretic (eg, triamterene, spironolactone or amiloride). Slow gastric emptying, esophageal compression, intestinal obstruction or stricture; anticholinergic therapy; active PUD; active UTI; renal insufficiency; resp or metabolic acidosis.