|
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] |
|
Copyright © 1978-2000 Lexi-Comp Inc. All Rights Reserved
|