Medical Editor: John P. Cunha, DO, FACOEP Last updated on RxList: 7/14/2022
Drug Description

What is K-LOR and how is it used?

K-LOR is a prescription medicine used as prophylaxis and also to treat the symptoms of Hypokalemia. K-LOR may be used alone or with other medications.

K-LOR belongs to a class of drugs called Electrolyte Supplements, Parenteral; Electrolytes.

It is not known if K-LOR is safe and effective in children younger than 1 month of age.

What are the possible side effects of K-LOR?

K-LOR may cause serious side effects including:

  • hives,
  • difficulty breathing,
  • swelling of your face, lips, tongue, or throat,
  • severe throat irritation,
  • chest pain,
  • pain, burning, bruising, swelling, irritation, or skin changes where the medicine was injected,
  • stomach bloating,
  • severe vomiting,
  • severe stomach pain,
  • nausea,
  • weakness,
  • tingly feeling,
  • chest pain,
  • irregular heartbeats,
  • loss of movement,
  • blood or tarry stools,
  • coughing up blood, and
  • vomit that looks like coffee grounds

Get medical help right away, if you have any of the symptoms listed above.

The most common side effects of K-LOR include:

  • nausea,
  • vomiting,
  • diarrhea,
  • gas,
  • stomach pain, and
  • the appearance of a potassium chloride tablet in your stool

Tell the doctor if you have any side effect that bothers you or that does not go away.

These are not all the possible side effects of K-LOR. For more information, ask your doctor or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.


Potassium chloride extended-release capsules are an oral dosage form of microencapsulated potassium chloride containing 600 mg and 750 mg of potassium chloride, USP, equivalent to 8 mEq and 10 mEq of potassium, respectively.

The chemical name of the active ingredient is potassium chloride and the structural formula is KCl. It has a molecular mass of 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.

Inactive ingredients: edible ink, ethylcellulose, FD&C Blue No. 2 aluminum lake, FD&C Yellow No. 6, gelatin, magnesium stearate, sodium lauryl sulfate, titanium dioxide. May contain FD&C Red No. 40 and FD&C Yellow No. 6 aluminum lakes.

Indications & Dosage

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Potassium chloride extended-release capsules are indicated for the treatment and prophylaxis of hypokalemia in adults and children with or without metabolic alkalosis, in patients for whom dietary management with potassium-rich foods or diuretic dose reduction is insufficient.


Administration And Monitoring

If serum potassium concentration is <2.5 mEq/L, use intravenous potassium instead of oral supplementation.


Monitor serum potassium and adjust dosages accordingly. Monitor serum potassium periodically during maintenance therapy to ensure potassium remains in desired range.

The treatment of potassium depletion, particularly in the presence of cardiac disease, renal disease, or acidosis requires careful attention to acid-base balance, volume status, electrolytes, including magnesium, sodium, chloride, phosphate, and calcium, electrocardiograms and the clinical status of the patient. Correct volume status, acid-base balance and electrolyte deficits as appropriate.


Take with meals and with a full glass of water or other liquid. Do not take on an empty stomach because of the potential for gastric irritation [see WARNINGS AND PRECAUTIONS].

Patients who have difficulty swallowing capsules may sprinkle the contents of the capsule onto a spoonful of soft food. The soft food, such as applesauce or pudding, should be swallowed immediately without chewing and followed with a glass of water or juice to ensure complete swallowing of the microcapsules. Do not added to hot foods. Any microcapsule/food mixture should be used immediately and not stored for future use.

Adult Dosing

Dosage must be adjusted to the individual needs of each patient. Dosages greater than 40 mEq per day should be divided such that no more than 40 mEq is given in a single dose.

Treatment of hypokalemia:Typical dose range is 40-100 mEq per day.

Maintenance or Prophylaxis: Typical dose is 20 mEq per day.

Pediatric Dosing

Pediatric patients aged birth to 16 years old: Dosage must be adjusted to the individual needs of each patient. Do not exceed as a single dose 1 mEq/kg or 20 mEq, whichever is lower.

Treatment of hypokalemia: The recommended initial dose is 2 to 4 mEq/kg/day in divided doses. If deficits are severe or ongoing losses are great, consider intravenous therapy.

Maintenance or Prophylaxis: Typical dose is 1 mEq/kg/day.


Dosage Forms And Strengths

600 mg (8 mEq): Opaque pale orange capsules imprinted in black ink “002” on the cap and “002” on the body

750 mg (10 mEq ): Opaque pale orange/opaque white capsules imprinted in black ink “001” on the cap and “001” on the body

Storage And Handling

Potassium chloride extended-release capsules contain 600 mg and 750 mg mg of potassium chloride (equivalent to 8 mEq and 10 mEq, respectively).

Table 1: How Supplied

Dose Color Printing NDC#: 68382-xxx-xx
Bottle Count
100 500
600 mg (8 mEq) orange “002” - body 702-01 702-05
“002” - cap
750 mg (10 mEq) white “001” - body 701-01 701-05
“001” - cap

Store at 20°-25°C (68°-77°F); excursions are permitted to 15° to 20°C (59°-86°F) [see USP Controlled Room Temperature.]

Dispense in tight, light-resistant container as defined in the USP, with a child-resistant closure.

Manufactured and Distributed By: Nesher Pharmaceuticals USA LLC., St. Louis, MO 63044. Distributed By: Zydus Pharmaceuticals USA Inc., Pennington, NJ 08534, Part #: RA-SUB2. Revised: Apr 2018


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Side Effects & Drug Interactions


The following adverse reactions have been identified with use of oral potassium salts. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

The most common adverse reactions to oral potassium salts are nausea, vomiting, flatulence, abdominal pain/discomfort, and diarrhea.

There have been reports of hyperkalemia and of upper and lower gastrointestinal conditions including, obstruction, bleeding, ulceration, and perforation.

Skin rash has been reported rarely.


Amiloride And Triamterene

Use with triamterene or amiloride can produce severe hyperkalemia. Concomitant use is contraindicated [see CONTRAINDICATIONS].

Renin-Angiotensin-Aldosterone Inhibitors

Drugs that inhibit the renin-angiotensin-aldosternone system (RAAS) including angiotensin converting enzyme (ACE) inhibitors, angiotensin receptor blockers (ARBs), spironolactone, eplerenone, or aliskiren produces potassium retention by inhibiting aldosterone production. Closely monitor potassium in patients taking drugs that inhibit RAAS.

Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)

NSAIDs may produce potassium retention by reducing renal synthesis of prostaglandin E and impairing the renin-angiotensin system. Closely monitor potassium in patients taking NSAIDS.

Warnings & Precautions


Included as part of the PRECAUTIONS section.


Gastrointestinal Adverse Reactions

Solid oral dosage forms of potassium chloride can produce ulcerative and/or stenotic lesions of the gastrointestinal tract, particularly if the drug is in contact with the gastrointestinal mucosa for a prolonged period of time. Consider the use of liquid potassium in patients with dysphagia, swallowing disorders, or severe gastrointestinal motility disorders.

If severe vomiting, abdominal pain, distention, or gastrointestinal bleeding occurs, discontinue potassium chloride extended-release capsules and consider possibility of ulceration, obstruction or perforation.

Potassium chloride extended-release capsules should not be taken on an empty stomach because of its potential for gastric irritation [see DOSAGE AND ADMINISTRATION].

Use In Specific Populations


Risk Summary

There are no human data related to use of potassium chloride extended-release capsules during pregnancy and animal reproductive studies have not been conducted. Potassium supplementation that does not lead to hyperkalemia is not expected to cause fetal harm.

The background risk for major birth defects and miscarriage in the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.


Risk Summary

The normal potassium ion content of human milk is about 13 mEq per liter. Since oral potassium becomes part of the body potassium pool, as long as body potassium is not excessive, the contribution of potassium chloride supplementation should have little or no effect on the level in human milk.

Pediatric Use

Clinical trial data from published literature have demonstrated the safety and effectiveness of potassium chloride in children with diarrhea and malnutrition from birth to 18 years.

Geriatric Use

Clinical studies of potassium chloride did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.

This drug is known to be substantially excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.


Based on publish literature, the baseline corrected serum concentrations of potassium measured over 3 hours after administration in cirrhotic subjects who received an oral potassium load rose to approximately twice that of normal subjects who received the same load. Patients with cirrhosis should usually be started at the low end of the dosing range, and the serum potassium level should be monitored frequently [see CLINICAL PHARMACOLOGY].

Renal Impairment

Patients with renal impairment have reduced urinary excretion of potassium and are at substantially increased risk of hyperkalemia. Patients with impaired renal function, particularly if the patient is on RAAS inhibitors or nonsteroidal anti-inflammatory drugs, should usually be started at the low end of the dosing range because of the potential for development of hyperkalemia [see DRUG INTERACTIONS]. The serum potassium level should be monitored frequently. Renal function should be assessed periodically.

Overdosage & Contraindications



The administration of oral potassium salts to persons with normal excretory mechanisms for potassium rarely causes serious hyperkalemia. However, if excretory mechanisms are impaired, potentially fatal hyperkalemia can result.

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 QTinterval). Late manifestations include muscle paralysis and cardiovascular collapse from cardiac arrest (9-12 mEq/L).


Treatment measures for hyperkalemia include the following:

  1. Monitor closely for arrhythmias and electrolyte changes.
  2. Eliminate foods and medications containing potassium and any agents with potassiumsparing properties such as potassium-sparing diuretics, ARBs, ACE inhibitors, NSAIDs, certain nutritional supplements, and many others.
  3. Administer intravenous calcium gluconate if the patient is at no risk or low risk of developing digitalis toxicity.
  4. Administer 300 to 500 mL/hr of 10% dextrose solution containing 10 to 20 units of crystalline insulin per 1,000 mL.
  5. Correct acidosis, if present, with intravenous sodium bicarbonate.
  6. Use exchange resins, hemodialysis, or peritoneal dialysis.

In patients who have been stabilized on digitalis, too rapid a lowering of the serum potassium concentration can produce digitalis toxicity.

The extended-release feature means that absorption and toxic effects may be delayed for hours. Consider standard measures to remove any unabsorbed drug.


Potassium chloride extended-release capsules are contraindicated in patients on amiloride or triamterene.

Clinical Pharmacology


Mechanism Of Action

The potassium ion (K+) 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.


Each crystal of KCl is microencapsulated and allows for the controlled release of potassium and chloride ions over an eight- to ten-hour period.

Specific Populations


Based on publish literature, the baseline corrected serum concentrations of potassium measured over 3 hours after administration in cirrhotic subjects who received an oral potassium load rose to approximately twice that of normal subjects who received the same load.

Medication Guide


Inform patients to take each dose with meals and with a full glass of water or other liquid.

Advise patients seek medical attention if tarry stools or other evidence of gastrointestinal toxicity is noticed.

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