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(Potassium Chloride Extended-release Tablets, USP)
10 mEq, 15 mEq and 20 mEq


Klor-Con® M20 is an immediately dispersing extended-release oral dosage form of potassium chloride containing 1500 mg of microencapsulated potassium chloride, USP equivalent to 20 mEq of potassium in a tablet.

Klor-Con® M15 is an immediately dispersing extended-release oral dosage form of potassium chloride containing 1125 mg of microencapsulated potassium chloride, USP equivalent to 15 mEq of potassium in a tablet.

Klor-Con® M10 is an immediately dispersing extended-release oral dosage form of potassium chloride containing 750 mg of microencapsulated potassium chloride, USP equivalent to 10 mEq of potassium in a tablet.

These formulations are intended to slow the release of potassium so that the likelihood of a high localized concentration of potassium chloride within the gastrointestinal tract is reduced.

Klor-Con® M is an electrolyte replenisher. The chemical name of the active ingredient is potassium chloride, and the structural formula is KCl (molecular weight: 74.55). Potassium chloride, USP occurs as a white, granular powder or as colorless crystals. It is odorless and has a saline taste. Its solutions are neutral to litmus. It is freely soluble in water and insoluble in alcohol.

Klor-Con® M is a tablet formulation (not enteric coated or wax matrix) containing individually microencapsulated potassium chloride crystals which disperse upon tablet disintegration. In simulated gastric fluid at 37°C and in the absence of outside agitation, Klor-Con® M begins disintegrating into microencapsulated crystals within seconds and completely disintegrates within one minute. The microencapsulated crystals are formulated to provide an extended release of potassium chloride.

Inactive Ingredients: croscarmellose sodium, ethylcellulose and microcrystalline cellulose.


The potassium ion is the principal intracellular cation of most body tissues. Potassium ions participate in a number of essential physiological processes including the maintenance of intracellular tonicity, the transmission of nerve impulses, the contraction of cardiac, skeletal and smooth muscle and the maintenance of normal renal function.

The intracellular concentration of potassium is approximately 150 to 160 mEq per liter. The normal adult plasma concentration is 3.5 to 5 mEq per liter. An active ion transport system maintains this gradient across the plasma membrane.

Potassium is a normal dietary constituent and under steady state conditions the amount of potassium absorbed from the gastrointestinal tract is equal to the amount excreted in the urine. The usual dietary intake of potassium is 50 to 100 mEq per day.

Potassium depletion will occur whenever the rate of potassium loss through renal excretion and/or loss from the gastrointestinal tract exceeds the rate of potassium intake. Such depletion usually develops as a consequence of therapy with diuretics, primary or secondary hyperaldosteronism, diabetic ketoacidosis or inadequate replacement of potassium in patients on prolonged parenteral nutrition. Depletion can develop rapidly with severe diarrhea, especially if associated with vomiting. Potassium depletion due to these causes is usually accompanied by a concomitant loss of chloride and is manifested by hypokalemia and metabolic alkalosis. Potassium depletion may produce weakness, fatigue, disturbances of cardiac rhythm (primarily ectopic beats), prominent U-waves in the electrocardiogram, and in advanced cases, flaccid paralysis and/or impaired ability to concentrate urine.

If potassium depletion associated with metabolic alkalosis cannot be managed by correcting the fundamental cause of the deficiency, e.g., where the patient requires long term diuretic therapy, supplemental potassium in the form of high potassium food or potassium chloride may be able to restore normal potassium levels.

In rare circumstances (e.g., patients with renal tubular acidosis) potassium depletion may be associated with metabolic acidosis and hyperchloremia. In such patients potassium replacement should be accomplished with potassium salts other than the chloride, such as potassium bicarbonate, potassium citrate, potassium acetate or potassium gluconate.



  • For the treatment of patients with hypokalemia with or without metabolic alkalosis, in digitalis intoxication and in patients with hypokalemic familial periodic paralysis. If hypokalemia is the result of diuretic therapy, consideration should be given to the use of a lower dose of diuretic, which may be sufficient without leading to hypokalemia.
  • For the prevention of hypokalemia in patients who would be at particular risk if hypokalemia were to develop, e.g., digitalized patients or patients with significant cardiac arrhythmias.

The use of potassium salts in patients receiving diuretics for uncomplicated essential hypertension is often unnecessary when such patients have a normal dietary pattern and when low doses of the diuretic are used. Serum potassium should be checked periodically, however, and if hypokalemia occurs, dietary supplementation with potassium-containing foods may be adequate to control milder cases. In more severe cases, and if dose adjustment of the diuretic is ineffective or unwarranted, supplementation with potassium salts may be indicated.


Potassium supplements are contraindicated in patients with hyperkalemia since a further increase in serum potassium concentration in such patients can produce cardiac arrest. Hyperkalemia may complicate any of the following conditions: chronic renal failure, systemic acidosis, such as diabetic acidosis, acute dehydration, extensive tissue breakdown as in severe burns, adrenal insufficiency or the administration of a potassium-sparing diuretic (e.g., spironolactone, triamterene or amiloride) (see OVERDOSAGE).

Extended-release formulations of potassium chloride have produced esophageal ulceration in certain cardiac patients with esophageal compression due to enlarged left atrium. Potassium supplementation, when indicated in such patients, should be given as a liquid preparation or as an aqueous (water) suspension of Klor-Con® M (see PRECAUTIONS; Information for Patients and DOSAGE AND ADMINISTRATION sections).

All solid oral dosage forms of potassium chloride are contraindicated in any patient in whom there is structural, pathological (e.g., diabetic gastroparesis) or pharmacologic (use of anticholinergic agents or other agents with anticholinergic properties at sufficient doses to exert anticholinergic effects) cause for arrest or delay in tablet passage through the gastrointestinal tract.




One of the most severe adverse effects is hyperkalemia (see CONTRAINDICATIONS, WARNINGS and OVERDOSAGE). There have also been reports of upper and lower gastrointestinal conditions including obstruction, bleeding, ulceration and perforation (see CONTRAINDICATIONS and WARNINGS).

The most common adverse reactions to oral potassium salts are nausea, vomiting, flatulence, abdominal pain/discomfort and diarrhea. These symptoms are due to irritation of the gastrointestinal tract and are best managed by diluting the preparation further, taking the dose with meals or reducing the amount taken at one time.


The administration of oral potassium salts to persons with normal excretory mechanisms for potassium rarely causes serious hyperkalemia. However, if excretory mechanisms are impaired or if potassium is administered too rapidly intravenously, potentially fatal hyperkalemia can result (see CONTRAINDICATIONS and WARNINGS). It is important to recognize that hyperkalemia is usually asymptomatic and may be manifested only by an increased serum potassium concentration (6.5-8.0 mEq/L) and characteristic electrocardiographic changes (peaking of T-waves, loss of P-waves, depression of S-T segment and prolongation of the QT-interval). Late manifestations include muscle paralysis and cardiovascular collapse from cardiac arrest (9-12 mEq/L).

Treatment measures for hyperkalemia include the following:

  • Elimination of foods and medications containing potassium and of any agents with potassium-sparing properties.
  • Intravenous administration of 300 to 500 mL/hr of 10% dextrose injection containing 10-20 units of crystalline insulin per 1,000 mL.
  • Correction of acidosis, if present, with intravenous sodium bicarbonate.
  • Use of exchange resins, hemodialysis or peritoneal dialysis.
    In treating hyperkalemia, it should be recalled that in patients who have been stabilized on digitalis, too rapid a lowering of the serum potassium concentration can produce digitalis toxicity.


The usual dietary intake of potassium by the average adult is 50 to 100 mEq per day. Potassium depletion sufficient to cause hypokalemia usually requires the loss of 200 or more mEq of potassium from the total body store.

Dosage must be adjusted to the individual needs of each patient. The dose for the prevention of hypokalemia is typically in the range of 20 mEq per day. Doses of 40-100 mEq per day or more are used for the treatment of potassium depletion. Dosage should be divided if more than 20 mEq per day is given such that no more than 20 mEq is given in a single dose.

Each Klor-Con® M20 tablet provides 1500 mg of potassium chloride equivalent to 20 mEq of potassium.

Each Klor-Con® M15 tablet provides 1125 mg of potassium chloride equivalent to 15 mEq of potassium.

Each Klor-Con® M10 tablet provides 750 mg of potassium chloride equivalent to 10 mEq of potassium.

Klor-Con® M tablets should be taken with meals and with a glass of water or other liquid. This product should not be taken on an empty stomach because of its potential for gastric irritation (see WARNINGS).

Patients having difficulty swallowing whole tablets may try one of the following alternate methods of administration:

  • Break the tablet in half and take each half separately with a glass of water.
  • Prepare an aqueous (water) suspension as follows:
    • Place the whole tablet(s) in approximately one-half glass of water (4 fluid ounces).
    • Allow approximately 2 minutes for the tablet(s) to disintegrate.
    • Stir for about half a minute after the tablet(s) has disintegrated.
    • Swirl the suspension and consume the entire spans of the glass immediately by drinking or by the use of a straw.
    • Add another one fluid ounce of water, swirl and consume immediately.
    • Then, add an additional one fluid ounce of water, swirl and consume immediately.
  •  Aqueous suspension of Klor-Con® M extended-release tablet that is not taken immediately should be discarded. The use of other liquids for suspending Klor-Con® M tablets is not recommended.


Klor-Con® M20 Extended-release Tablets, 1500 mg of potassium chloride (20 mEq of potassium) are available in bottles of 90 (NDC 0245-0058-90); bottles of 100 (NDC 0245-0058-11); bottles of 500 (NDC 0245-0058-15); bottles of 1000 (NDC 0245-0058-10); and cartons of 100 for unit dose dispensing (NDC 0245-0058-01). Klor-Con® M20 tablets are white, oblong, imprinted KC M20 and scored for flexibility of dosing.

Klor-Con® M15 Extended-release Tablets, 1125 mg of potassium chloride (15 mEq of potassium) are available in bottles of 100 (NDC 0245-0150-11); bottles of 1000 (NDC 0245-0150-10); and cartons of 100 for unit dose dispensing (NDC 0245-0150-01). Klor-Con® M15 tablets are white, oblong, imprinted M 15 and scored for flexibility of dosing.

Klor-Con® M10 Extended-release Tablets, 750 mg of potassium chloride (10 mEq of potassium) are available in bottles of 90 (NDC 0245-0057-90); bottles of 100 (NDC 0245-0057-11); bottles of 1000 (NDC 0245-0057-10); and cartons of 100 for unit dose dispensing (NDC 0245-0057-01). Klor-Con® M10 tablets are white, oblong and imprinted KC M10.