Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
Quick facts
- How it is given
- intravenous
- Type
- human prescription drug
- RxNorm ID
- 312507
We do not publish dosing. How much of this medicine to take, how often, and for how long depends on your age, weight, kidney and liver function, other conditions and other medicines. That is a decision for the person who prescribes or dispenses it. Follow the directions on your own pack and ask your pharmacist if anything is unclear.
What it is used to treat
INDICATIONS AND USAGE Potassium Chloride Injection is indicated in the treatment of potassium deficiency states when oral replacement is not feasible. THIS HIGHLY CONCENTRATED, READY-TO-USE POTASSIUM CHLORIDE INJECTION IS INTENDED FOR THE MAINTENANCE OF SERUM K + LEVELS AND FOR POTASSIUM SUPPLEMENTATION IN FLUID RESTRICTED PATIENTS WHO CANNOT ACCOMMODATE ADDITIONAL VOLUMES OF FLUID ASSOCIATED WITH POTASSIUM SOLUTIONS OF LOWER CONCENTRATION. When using these products, these patients should be on continuous cardiac monitoring and frequent testing for serum potassium concentration and acid-base balance.
About this medicine
DESCRIPTION This Potassium Chloride Injection, is a sterile, nonpyrogenic, highly concentrated, ready-to-use, solution of Potassium Chloride, USP in Water for Injection, USP for electrolyte replenishment in a single dose container for intravenous administration. It contains no antimicrobial agents. Potassium Chloride Injection mEq Potassium/Container Composition (g/L) Potassium Chloride, USP (KCl) Osmolarity Normal physiologic osmolarity range is approximately 280 to 310 mOsmol/L. Administration of substantially hypertonic solutions (≥ 600 mOsmol/L) may cause vein damage. (mOsmol/L) (calc) pH Ionic Concentration (mEq/L) Potassium Chloride 10 mEq/100 mL 7.46 200 5.0 (4.0 to 8.0) 100 100 10 mEq/50 mL 20 mEq/100 mL 14.9 400 5.0 (4.0 to 8.0) 200 200 20 mEq/50 mL 40 mEq/100 mL 29.8 799 5.0 (4.0 to 8.0) 400 400 This Viaflex Plus plastic container is fabricated from a specially formulated polyvinyl chloride. Exposure to temperatures above 25°C/77°F during transport and storage will lead to minor losses in moisture content. Higher temperatures lead to greater losses. It is unlikely that these minor losses will lead to clinically significant changes within the expiration period. The amount of water that can permeate from inside the container into the overwrap is insufficient to affect the solution significantly. Solutions in contact with the plastic container may leach out certain of its chemical components from the plastic in very small amounts; however, biological testing was supportive of the safety of the plastic container materials.
Who should not take it
CONTRAINDICATIONS Potassium Chloride Injection is contraindicated in patients with: • hyperkalemia • known hypersensitivity to Potassium Chloride Injection
Warnings
WARNINGS Hyperkalemia THIS HIGHLY CONCENTRATED, READY-TO-USE POTASSIUM CHLORIDE INJECTION IS INTENDED FOR THE MAINTENANCE OF SERUM K + LEVELS AND FOR POTASSIUM SUPPLEMENTATION IN FLUID RESTRICTED PATIENTS WHO CANNOT ACCOMMODATE ADDITIONAL VOLUMES OF FLUID ASSOCIATED WITH POTASSIUM SOLUTIONS OF LOWER CONCENTRATION. TO AVOID POTASSIUM INTOXICATION, DO NOT INFUSE THESE SOLUTIONS RAPIDLY. Potassium Chloride Injection should be administered with extreme caution, if at all, to patients with conditions predisposing to hyperkalemia and/or associated with increased sensitivity to potassium, such as patients with: • severe renal impairment, • acute dehydration, • extensive tissue injury or burns, • certain cardiac disorders such as congestive heart failure or AV block, • potassium-aggravated skeletal muscle channelopathies (e.g., hyperkalemic periodic paralysis, paramyotonia congenita, and potassium-aggravated myotonia/paramyotonia). Potassium Chloride Injection should be administered with caution to patients who are at risk of experiencing hyperosmolality, acidosis, or undergo correction of alkalosis (conditions associated with a shift of potassium from intracellular to extracellular space) and patients treated concurrently or recently with agents or products that can cause hyperkalemia (see PRECAUTIONS , Drug Interactions ). If used in high-risk patients, especially close monitoring and careful dose selection and adjustment is required. PATIENTS REQUIRING HIGHLY CONCENTRATED SOLUTIONS SHOULD BE KEPT ON CONTINUOUS CARDIAC MONITORING AND UNDERGO FREQUENT TESTING FOR SERUM POTASSIUM AND ACID-BASE BALANCE, ESPECIALLY IF THEY RECEIVE DIGITALIS. Administration of concentrated potassium solutions can cause cardiac conduction disorders (including complete heart block) and other cardiac arrhythmias at any time during infusion. Continuous cardiac monitoring is performed to aid in the detection of cardiac arrhythmias due to a sudden increase in serum potassium concentration (e.g., when potassium infusion is started), or transient or sustained hyperkalemia (see ADVERSE REACTIONS and OVERDOSAGE ). […]
Reported side effects
ADVERSE REACTIONS The following adverse reactions associated with the use of Potassium Chloride Injection were identified in postmarketing reports. Because these reactions were reported voluntarily from a population of uncertain size, it is not always possible to estimate their frequency, reliably, or to establish a causal relationship to drug exposure. Immune system disorders: Hypersensitivity, as manifested by rash and angioedema Metabolism and nutrition disorders: Hyperkalemia, hyponatremia Cardiac disorders: Cardiac arrest*, asystole*, ventricular fibrillation*, bradycardia *as a manifestation of rapid intravenous administration and/or of hyperkalemia Respiratory, Thoracic, and Mediastinal Disorders: Dyspnea General disorders and administration site conditions: Chest pain, infusion site thrombosis, infusion site phlebitis, infusion site erythema, infusion site swelling, infusion site pain, infusion site irritation, and/or a burning sensation. Nervous System Disorders: Hyponatremic encephalopathy The following adverse reactions were reported in association with extravasation: Skin necrosis, skin ulcer, soft tissue necrosis, muscle necrosis, nerve injury, tendon injury, and vascular injury.
Interactions with other medicines
Drug Interactions Other Products that Cause Hyperkalemia Administration of Potassium Chloride Injection in patients treated concurrently or recently with other products that can cause hyperkalemia or increase the risk of hyperkalemia (e.g., potassium-sparing diuretics, ACE inhibitors, angiotensin II receptor antagonists, cyclosporine and tacrolimus) increases the risk of severe and potentially fatal hyperkalemia, in particular in the presence of other risk factors for hyperkalemia (see WARNINGS ). Avoid use of Potassium Chloride injection in patients receiving such products. If use cannot be avoided, monitor serum potassium concentrations. Other Drugs that Increase the Risk of Hyponatremia Administration of Potassium Chloride Injection in patients treated concomitantly with drugs associated with hyponatremia may increase the risk of developing hyponatremia (see WARNINGS ). Avoid use of Potassium Chloride Injection in patients receiving drugs that may increase the risk of hyponatremia, such as diuretics and antiepileptics. Drugs that increase the vasopressin effect reduce renal electrolyte free water excretion and may also increase the risk of hyponatremia following treatment with intravenous fluids. If use cannot be avoided, monitor serum sodium concentrations.
If too much is taken
OVERDOSAGE Potassium overdose can cause potentially fatal hyperkalemia. Manifestations of hyperkalemia include: • Disturbances in cardiac conduction and arrhythmias, including bradycardia, heart block, asystole, ventricular tachycardia, ventricular fibrillation • Hypotension • Muscle weakness up to and including muscular and respiratory paralysis, paresthesia • Gastrointestinal symptoms (ileus, nausea, vomiting, abdominal pain) Frequently, mild or moderate hyperkalemia is asymptomatic and may be manifested only by increased serum potassium concentrations and, possibly, characteristic electrocardiographic changes. However, fatal arrhythmias can develop at any time. In addition to arrhythmias and conduction disorders, the EKG shows progressive changes that occur with increasing potassium levels. Possible changes include: • peaking of T waves, • loss of P waves, and • QRS widening. However, the correlation between potassium levels and EKG changes is not precise, and whether or at which potassium level certain EKG signs develop depends on factors such as patient sensitivity, the presence of other electrolyte disorders, and the rapidity of the development of hyperkalemia. The presence of any EKG findings that are suspected to be caused by hyperkalemia should be considered a medical emergency. In the event of hyperkalemia, discontinue the infusion immediately and institute close EKG, laboratory and other monitoring and, as necessary, corrective therapy to reduce serum potassium levels as necessary. The use of potassium containing foods or medications must also be eliminated. Treatment of mild to severe hyperkalemia with signs and symptoms of potassium intoxication includes the following: 1. Dextrose Injection, USP, 10% or 25%, containing 10 units of crystalline insulin per 20 grams of dextrose administered intravenously, 300 to 500 mL per hour. 2. Absorption and exchange of potassium using sodium or ammonium cycle cation exchange resin, orally and as retention enema. 3. Hemodialysis and peritoneal dialysis. In cases of digitalization, too rapid a lowering of plasma potassium concentration can cause digitalis toxicity.
Before you take anything new
Tell your pharmacist or doctor about every medicine you take — including ones bought without a prescription, herbal products and supplements. Interactions are one of the most common avoidable causes of harm from medicines, and a pharmacist can check your full list in a couple of minutes.
This page is built from the openFDA record of the U.S. Food and Drug Administration's approved labelling for this product, effective 9 January 2026. Label text has been shortened and reformatted for readability; safety wording has not been altered in meaning. FDA labelling describes products approved in the United States — brand names, strengths, formulations and approved uses may differ in your country. Always read the leaflet that comes with your own pack. PocketsInfo is not affiliated with, and is not endorsed by, the FDA. Retrieved 2026-07-30.