Potassium Phosphates

Generic Name: potassium phosphate, monobasic and potassium phosphate, dibasic
Dosage Form: injection, solution

Disclaimer: This drug has not been found by FDA to be safe and effective, and this labeling has not been approved by FDA. For further information about unapproved drugs, click here.

Potassium Phosphates Injection USP

3 mmol Phosphate/mL and 4.4 mEq Potassium/mL


Potassium Phosphates Description

Potassium Phosphates Injection, USP is a sterile, nonpyrogenic, concentrated solution containing a mixture of mono and dibasic potassium phosphate in Water for Injection q.s.  It must be diluted prior to administration.

7.4 mOsmol/mL     pH 6.2 to 6.8

Each mL of the solution consists of two phosphate salts provided as follows:




Monobasic Potassium Phosphate – 224 mg    

285 mg

(3 mmol)

170 mg

(4.4 mEq)

Dibasic Potassium Phosphate – 236 mg

The solution contains no bacteriostatic agent or other preservatives.  Unused portions should be discarded.

The solution is intended to provide phosphate ion; (PO43-) for addition to large volume infusion fluids for intravenous use.

Potassium Phosphates - Clinical Pharmacology

Phosphorus in the form of organic and inorganic phosphate has a variety of important biochemical functions in the body and is involved in many significant metabolic and enzyme reactions in almost all organs and tissues.  It exerts a modifying influence on the steady state of calcium levels, a buffering effect on acid-base equilibrium and a primary role in the renal excretion of hydrogen ion.

Phosphorus is present in plasma and other extracellular fluid, in cell membranes and intracellular fluid, as well as in collagen and bone tissues.  Phosphate in the extracellular fluid is primarily in inorganic form, and plasma-levels may vary somewhat with age.  The ratio of disodium phosphate and monosodium phosphate in the extracellular fluid is 4:1 (80%:20%) at the normal pH of 7.4.  This buffer ratio varies with the pH, but owing to its relatively low concentration, it contributes little to the buffering capacity of the extracellular fluids.

Phosphate, present in large amounts in erythrocytes and other tissue cells, plays a significant intracellular role in the synthesis of high energy organic phosphates.

Hypophosphatemia should be avoided during periods of total parenteral nutrition, or other lengthy periods of intravenous infusions.  Serum phosphate levels should be regularly monitored, and appropriate amounts of phosphate should be added to the infusions to maintain normal serum phosphate levels.  Intravenous infusion of inorganic phosphate may be accompanied by a decrease in the serum level and urinary excretion of calcium.  Intravenously infused phosphate not taken up by the tissues is excreted almost entirely in the urine.

Indications and Usage for Potassium Phosphates

Potassium Phosphates Injection, USP is indicated as a source of phosphate, for addition to large volume intravenous fluids to prevent or correct hypophosphatemia in patients with restricted or no oral intake. It is also useful as an additive for preparing specific intravenous fluid formulas when the needs of the patient cannot be met by standard electrolyte of nutrient solutions.


Potassium Phosphates is contraindicated in diseases where high potassium, high phosphate or low calcium levels may be encountered.


Potassium Phosphates must be diluted before use.

WARNING: This product contains aluminum that may be toxic.  Aluminum may reach toxic levels with prolonged parenteral administration if kidney function is impaired.  Premature neonates are particularly at risk because their kidneys are immature, and they require large amounts of calcium and phosphate solutions, which contain aluminum.

Research indicates that patients with impaired kidney function, including premature neonates, who receive parenteral levels of aluminum at greater than 4 to 5 mcg/kg/day accumulate aluminum at levels associated with central nervous system and bone toxicity.  Tissue loading may occur at even lower rates of administration.

To avoid potassium or phosphate intoxication, infuse solutions containing Potassium Phosphates slowly.  In patients with severe renal or adrenal insufficiency, administration of Potassium Phosphates may cause potassium intoxication, infusing high concentrations of phosphate may cause hypocalcemia, and calcium levels should be monitored.


Phosphate replacement therapy with Potassium Phosphates should be guided primarily by the serum inorganic phosphate level and the limits imposed by the accompanying potassium (K+) ion.

High plasma concentrations of potassium may cause death through cardiac depression, arrhythmias or arrest.

Use with caution in the presence of cardiac disease, particularly in digitalized patients or in the presence of renal disease.

Adverse Reactions

Adverse reactions involve the possibility of combined potassium and phosphate intoxication from overdosage.  The signs and symptoms of potassium intoxication include paresthesias of the extremities, flaccid paralysis, listlessness, mental confusion, weakness and heaviness of the legs, hypotension, cardiac arrhythmias, heartblock, electrocardiographic abnormalities such as disappearance of P waves, spreading and slurring of the QRS complex with development of a biphasic curve and cardiac arrest.  Phosphate intoxication results in a reduction of serum calcium, and the symptoms are those of hypocalcemic tetany, (see WARNINGS).

Potassium Phosphates Dosage and Administration

Potassium Phosphates is administered intravenously only after dilution in a larger volume of fluid.  The dose and rate of administration are dependent upon the individual needs of the patient.  Serum potassium, inorganic phosphorus and calcium levels should be monitored as a guide to dosage.

Withdraw the calculated volume aseptically and transfer to appropriate intravenous fluid to provide the desired number of millimoles (mmol) of phosphate and milliequivalent (mEq) of Potassium (K+).


In the event of overdosage, discontinue infusions containing Potassium Phosphates immediately, and institute corrective therapy to restore depressed serum calcium and to reduce elevated serum potassium levels.

Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.

How is Potassium Phosphates Supplied

Potassium Phosphates Injection, USP, 3 mmol/mL, packaged 25 per carton is available as follows:








5 mL fill in a 10 mL single dose, flip-top vial.



15 mL fill in a 30 mL single dose, flip-top vial.



50 mL a single dose, flip-top vial.

The quantity of phosphate/mL is 285 mg and the quantity of potassium/mL is 170 mg.  This product is preservative free.  Any unused portion should be discarded.

Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature].



Revised: August 2013

PACKAGE LABEL - PRINCIPAL DISPLAY PANEL - Potassium Phosphates 50 mL Single Dose Vial

NDC 63323-086-50


Potassium Phosphates Injection, USP

Phosphorus 150 mmol / 50 mL  (3 mmol/mL)

Potassium 220 mEq / 50 mL  (4.4 mEq/mL)

For IV Use Only After Dilution

50 mL Single Dose Vial

Rx only


Potassium Phosphates 
potassium phosphate, monobasic and potassium phosphate, dibasic injection, solution
Product Information
Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:63323-086
Route of Administration INTRAVENOUS DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
# Item Code Package Description
1 NDC:63323-086-05 25 VIAL, SINGLE-DOSE (25 VIAL) in 1 TRAY
2 NDC:63323-086-15 25 VIAL, SINGLE-DOSE (25 VIAL) in 1 TRAY
2 15 mL in 1 VIAL, SINGLE-DOSE
3 NDC:63323-086-50 25 VIAL, SINGLE-DOSE (25 VIAL) in 1 TRAY
3 50 mL in 1 VIAL, SINGLE-DOSE
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
Unapproved drug other 08/08/2000
Labeler - Fresenius Kabi USA, LLC (608775388)
Name Address ID/FEI Operations
Fresenius Kabi USA, LLC 023648251 MANUFACTURE(63323-086)
Revised: 09/2013
Fresenius Kabi USA, LLC