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Potassium Acid Phosphate
Pronunciation
U.S. Brand Names
Generic Available
Pharmacological Index
Use
Pregnancy Risk Factor
Contraindications
Warnings/Precautions
Adverse Reactions
Overdosage/Toxicology
Drug Interactions
Mechanism of Action
Pharmacodynamics/Kinetics
Usual Dosage
Dietary Considerations
Monitoring Parameters
Test Interactions
Dental Health: Local Anesthetic/Vasoconstrictor Precautions
Dental Health: Effects on Dental Treatment
Patient Information
Nursing Implications
Dosage Forms

Pronunciation
(poe TASS ee um AS id FOS fate)

U.S. Brand Names
K-Phos® Original

Generic Available

No


Pharmacological Index

Urinary Acidifying Agent


Use

Acidifies urine and lowers urinary calcium concentration; reduces odor and rash caused by ammoniacal urine; increases the antibacterial activity of methenamine


Pregnancy Risk Factor

C


Contraindications

Severe renal impairment, hyperkalemia, hyperphosphatemia, and infected magnesium ammonium phosphate stones


Warnings/Precautions

Use with caution in patients receiving other potassium supplementation and in patients with renal insufficiency, or severe tissue breakdown (eg, chemotherapy or hemodialysis)


Adverse Reactions

>10%: Gastrointestinal: Diarrhea, nausea, stomach pain, flatulence, vomiting

1% to 10%:

Cardiovascular: Bradycardia

Endocrine & metabolic: Hyperkalemia

Local: Local tissue necrosis with extravasation

Neuromuscular & skeletal: Weakness

Respiratory: Dyspnea

<1%: Chest pain, arrhythmia, edema, mental confusion, tetany, pain of extremities, hyperphosphatemia, hypocalcemia, alkalosis, abdominal pain, weight gain, throat pain, decreased urine output, phlebitis, paresthesias, paralysis, bone pain, arthralgia, weakness of extremities, shortness of breath, thirst


Overdosage/Toxicology

Symptoms of overdose include muscle weakness, paralysis, peaked T waves, flattened P waves, prolongation of QRS complex, ventricular arrhythmias

Removal of potassium can be accomplished by various means; removal through the GI tract with Kayexalate® administration; by way of the kidney through diuresis, mineralocorticoid administration or increased sodium intake; by hemodialysis or peritoneal dialysis; or by shifting potassium back into the cells by insulin and glucose infusion or sodium bicarbonate; calcium chloride will reverse cardiac effects.


Drug Interactions

Increased effect/levels with potassium-sparing diuretics, salt substitutes, salicylates, ACE inhibitors

Decreased effect with antacids containing magnesium, calcium or aluminum (bind phosphate and decreased its absorption)


Mechanism of Action

The principal intracellular cation; involved in transmission of nerve impulses, muscle contractions, enzyme activity, and glucose utilization


Pharmacodynamics/Kinetics

Absorption: Absorbed well from upper GI tract

Distribution: Enters cells via active transport from extracellular fluid

Elimination: Largely by the kidneys, but also small amount via the skin and feces, with most intestinal potassium being reabsorbed


Usual Dosage

Adults: Oral: 1000 mg dissolved in 6-8 oz of water 4 times/day with meals and at bedtime; for best results, soak tablets in water for 2-5 minutes, then stir and swallow


Dietary Considerations

May be administered with meals


Monitoring Parameters

Serum potassium, sodium, phosphate, calcium; serum salicylates (if taking salicylates)


Test Interactions

ammonia (B)


Dental Health: Local Anesthetic/Vasoconstrictor Precautions

No information available to require special precautions


Dental Health: Effects on Dental Treatment

No effects or complications reported


Patient Information

Dissolve tablets completely before drinking; avoid taking magnesium, calcium, or aluminum antacids at the same time; patients may pass old kidney stones when starting therapy; notify physician if experiencing nausea, vomiting, or abdominal pain


Nursing Implications

Monitor renal function, electrolytes, calcium, phosphorus, serum potassium


Dosage Forms

Tablet, sodium free: 500 mg [potassium 3.67 mEq]


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