eMedicine Specialties > Nephrology > Acid-Base, Fluid, and Electrolyte Disorders
Hypokalemia: Treatment & Medication
Updated: Aug 5, 2009
- Overview
- Differential Diagnoses & Workup
- Treatment & Medication
- Follow-up
Treatment
Medical Care
Orient medical care toward 4 different aims: (1) decreasing potassium losses, (2) replenishing potassium stores, (3) evaluating for potential toxicities, and (4) determining the cause to prevent future episodes.
- In treating hypokalemia, the first step is to identify and stop ongoing losses of potassium.
- Discontinue diuretics/laxatives.
- Use potassium-sparing diuretics if diuretic therapy is required (eg, severe heart failure).
- Treat diarrhea or vomiting.
- Use H2 blockers to decrease nasogastric suction losses.
- Control hyperglycemia if glycosuria is present.
- Repletion of potassium losses is the second step.
- As a first approximation, for every decrease in serum potassium of 1 mEq/L, the potassium deficit is approximately 200-400 mEq. However, bear in mind that many factors in addition to the total body potassium stores contribute to the serum potassium concentration. Therefore, this calculation could either overestimate or underestimate the true potassium deficit.
- Oral potassium is absorbed readily. Relatively large doses can be given safely. Oral administration is limited by patient tolerance because some individuals develop nausea or even gastrointestinal ulceration with enteral potassium formulations.
- Intravenous potassium is less well tolerated because it can be highly irritating to veins and can be given only in relatively small doses, generally 10 mEq/h. Under close cardiac supervision in emergent circumstances, as much as 40 mEq/h can be administered through a central line.
- Oral and parenteral potassium can be used safely simultaneously.
- Take ongoing potassium losses into consideration by measuring the volume and potassium concentration of body fluid losses.
- If the patient is severely hypokalemic, avoid glucose-containing parenteral fluids to prevent an insulin-induced shift of potassium into the cells.
- If the patient is acidotic, correct the potassium first to prevent an alkali-induced shift of potassium into the cells.
- Replete magnesium if low.
- Tailor treatment to the individual patient. For example, if diuretics cannot be discontinued due to an underlying disorder such as congestive heart failure, institute potassium-sparing therapies such as a low-sodium diet, potassium-sparing diuretics, ACE inhibitors, and angiotensin receptor blockers. The low-sodium diet and potassium-sparing diuretics limit the amount of sodium reabsorbed at the cortical collecting tubule, thus limiting the amount of potassium secreted. ACE inhibitors and angiotensin receptor blockers inhibit the release of aldosterone, thus blocking the kaliuretic effects of that hormone.
- Monitor for toxicity of hypokalemia. Generally, the toxicity of hypokalemia is cardiac in nature. Monitor the patient if evidence of cardiac arrhythmias is observed, and institute very aggressive replacement parenterally under monitored conditions.
- Determine the underlying cause to treat and prevent further episodes.
- Again, history and physical examination findings clarify the cause in the vast majority of cases.
- Look for clues to the etiology.
- Urine potassium concentration
- Presence of hypertension or hypotension
- Acid-base disturbances
- Family history
- Tooth erosion; melanosis coli; obsession with body image; high-risk behaviors such as cheerleading, wrestling, or modeling; or evidence of alcohol abuse
- Tailor the workup to the individual patient if the cause is not completely apparent.
Surgical Care
Generally, hypokalemia is a medical, not a surgical, condition. Surgical intervention is required only after determining that the etiology requires it. Etiologies that may require surgery include the following:- Renal artery stenosis
- Adrenal adenoma
- Intestinal obstruction producing massive vomiting
- Villous adenoma
Consultations
The following consultations may be appropriate, depending on the clinical findings:
- Renal specialist for evaluation of unexplained urinary potassium losses suggested to be secondary to a tubular disorder
- Endocrinologist if Cushing syndrome, primary hyperaldosteronism, glucocorticoid-remediable hypertension, or congenital adrenal hyperplasia is suggested
- Psychiatrist for alcoholism or eating disorders
- Surgeon (see Surgical Care)
Diet
In general, a low-sodium and high-potassium diet is appropriate.
Activity
Unless the patient has severe underlying cardiac disease, no restrictions are necessary. Instruct patients to discontinue exercise if muscle pain or cramps develop because this may herald hypokalemia significant enough to produce rhabdomyolysis.
Medication
The goals of pharmacotherapy are to reduce morbidity, to prevent complications, and to correct the deficiency.
Electrolytes
Oral or parenteral therapy for potassium replacement.
Potassium chloride (K-Dur, K-Lyte Cl, Kay Ciel)
Essential for transmission of nerve impulses, contraction of cardiac muscle, maintenance of intracellular tonicity, skeletal and smooth muscles, and maintenance of normal renal function. Gradual potassium depletion occurs via renal excretion, through GI loss, or because of low intake. Most respond well to small supplements. Unflavored liquid replacement has an unpleasant taste, and pills may be conducive to better compliance. Long-acting supplements often are not as well absorbed, but microencapsulated forms often are better tolerated. Tailor dose to patient's needs.
Adult
<10 mEq/h IV
Emergent conditions: 40 mEq/h IV can be given through central venous line
Pediatric
Not established
Concurrent use with ACE inhibitors may result in elevated serum potassium concentrations; potassium-sparing diuretics and potassium-containing salt substitutes can produce severe hyperkalemia; in patients taking digoxin, hypokalemia may result in digoxin toxicity; caution if discontinuing potassium administration in patients maintained on digoxin
Documented hypersensitivity; hyperkalemia, renal failure, and conditions in which potassium retention is present; oliguria or azotemia, crush syndrome, severe hemolytic reactions, anuria, and adrenocortical insufficiency
Pregnancy
A - Fetal risk not revealed in controlled studies in humans
Precautions
Do not infuse rapidly; high plasma concentrations of potassium may cause death due to cardiac depression, arrhythmias, or arrest; plasma levels do not necessarily reflect tissue levels; monitor potassium replacement therapy whenever possible by continuous or serial ECG; when a concentration of >40 mEq/L is infused, local pain and phlebitis may follow; GI irritation may occur with oral preparations
Potassium citrate (Urocit K, Polycitra, Bicitra)
Oral preparation with a base instead of an acid anion. Generally used for patients who form calcium stones or for severe metabolic acidosis. Not as effective as potassium chloride for replacement in the general population. Tailor dose to patients' needs.
Adult
Urocit: 3 tab PO tid
Polycitra or Bicitra: 1 mL/kg/d PO
Pediatric
Urocit: Not established
Polycitra or Bicitra: Administer as in adults
Concurrent use with ACE inhibitors may result in elevated serum potassium concentrations; potassium-sparing diuretics and potassium-containing salt substitutes can produce severe hyperkalemia; in patients taking digoxin, hypokalemia may result in digoxin toxicity; caution if discontinuing potassium administration in patients maintained on digoxin
Documented hypersensitivity; hyperkalemia
Pregnancy
A - Fetal risk not revealed in controlled studies in humans
Precautions
Caution in patients taking potassium-sparing diuretics, ACE inhibitors, or angiotensin II receptor blockers
Angiotensin-converting enzyme inhibitors
Inhibit production of aldosterone and decrease renal potassium losses. All the drugs in this category work in the same way. Differences are in the duration of action and the ability to inhibit locally produced and circulating ACE.
Captopril (Capoten)
Prevents conversion of angiotensin I to angiotensin II, a potent vasoconstrictor, resulting in lower aldosterone secretion. Shortest acting and requires bid or tid dosing. Others in class can be taken qd.
Adult
6.25 mg PO bid; not to exceed 100 mg PO tid
Pediatric
Not established
NSAIDs may reduce hypotensive effects; ACE inhibitors may increase digoxin, lithium, and allopurinol levels; rifampin decreases levels; probenecid may increase levels; hypotensive effects of ACE inhibitors may be enhanced when given concurrently with diuretics
Documented hypersensitivity, renal impairment, hyperkalemia
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Precautions
Pregnancy category D in second and third trimesters; can result in fetal abnormalities if taken during pregnancy; caution in renal impairment, valvular stenosis, or severe congestive heart failure; can cause hypotension, hyperkalemia, or angioedema
Enalapril (Vasotec)
Competitive inhibitor of ACE. Reduces angiotensin II levels, decreasing aldosterone secretion.
Adult
2.5 mg PO qd; not to exceed 40 mg PO qd
Pediatric
1 month to 16 years: 0.08 mg/kg (up to 5 mg) qd
NSAIDs may reduce hypotensive effects; ACE inhibitors may increase digoxin, lithium, and allopurinol levels; rifampin decreases levels; probenecid may increase levels; hypotensive effects of ACE inhibitors may be enhanced when given concurrently with diuretics
Documented hypersensitivity
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Precautions
Pregnancy category D in second and third trimesters; can result in fetal abnormalities if taken during pregnancy; caution in renal impairment, valvular stenosis, or severe congestive heart failure; can cause hypotension, hyperkalemia, or angioedema
Fosinopril (Monopril)
Prevents conversion of angiotensin I to angiotensin II, a potent vasoconstrictor, resulting in lower aldosterone secretion.
Adult
10-40 mg PO qd
Pediatric
<50 kg: Not established
>50 kg: 5-10 mg qd
NSAIDs may reduce hypotensive effects; ACE inhibitors may increase digoxin, lithium, and allopurinol levels; rifampin decreases levels; probenecid may increase levels; hypotensive effects of ACE inhibitors may be enhanced when given concurrently with diuretics
Documented hypersensitivity
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Precautions
Pregnancy category D in second and third trimesters; can result in fetal abnormalities if taken during pregnancy; caution in severe congestive heart failure; can cause hypotension, hyperkalemia, or angioedema
Ramipril (Altace)
Prevents conversion of angiotensin I to angiotensin II, a potent vasoconstrictor, resulting in increased levels of plasma renin and a reduction in aldosterone secretion.
Adult
2.5-5 mg PO qd; not to exceed 20 mg/d
Pediatric
Not established
NSAIDs may reduce hypotensive effects of ramipril; ACE inhibitors may increase digoxin, lithium, and allopurinol levels; rifampin decreases ramipril levels; probenecid may increase ramipril levels; the hypotensive effects of ACE inhibitors may be enhanced when given concurrently with diuretics
Documented hypersensitivity; history of angioedema
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Precautions
Pregnancy category D in second and third trimesters; caution in renal impairment, valvular stenosis, or severe congestive heart failure; may cause fetal abnormalities if taken during pregnancy
Potassium-sparing diuretics
Excellent adjunct therapy when ongoing renal losses are anticipated. May be used in conjunction with thiazide or loop diuretics.
Triamterene (Dyrenium)
Potassium-sparing diuretic with relatively weak natriuretic properties. Exerts diuretic effect on distal renal tubule to inhibit reabsorption of sodium in exchange for potassium and hydrogen. Not a competitive antagonist of mineralocorticoids, and potassium-conserving effect is observed in patients with Addison disease (ie, without aldosterone).
Adult
100-300 mg/d PO in divided doses
Pediatric
Not established
Coadministration with other potassium-conserving agents (eg, spironolactone, amiloride HCl) or other formulations containing triamterene may significantly increase serum potassium levels; lithium generally should not be given with diuretics; reduced renal clearance of lithium and high risk of lithium toxicity with concomitant diuretics; acute renal failure reported in patients receiving indomethacin and formulations containing triamterene; administer NSAIDs with caution (monitor serum potassium frequently); may interfere with measurement of quinidine
Documented hypersensitivity, elevated serum potassium levels (>5.5 mEq/L); impaired renal function (anuria, acute and chronic renal insufficiency, or significant renal impairment); diabetes
Pregnancy
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Precautions
Severe hepatic encephalopathy, diabetes, renal dysfunction, history of renal stones
Amiloride (Midamor)
Pyrazine-carbonyl-guanidine unrelated chemically to other known antikaliuretic or diuretic agents. Potassium-sparing (antikaliuretic) drug that, compared to thiazide diuretics, possesses weak natriuretic, diuretic, and antihypertensive activity.
Adult
5-20 mg PO qd
Pediatric
<6 kg: Not established
>6 kg: 0.625 mg/kg/d PO
Concomitant therapy with potassium supplementation may increase serum potassium levels; if concomitant use of these agents indicated because of demonstrated hypokalemia, caution and monitor serum potassium frequently; lithium generally should not be given with diuretics; reduced renal clearance of lithium and high risk of lithium toxicity with concomitant diuretics; administration of NSAIDs can reduce diuretic, natriuretic, and antihypertensive effects of loop, potassium-sparing, and thiazide diuretics when used concomitantly; observe patient closely to determine if desired effect of diuretic obtained; indomethacin and potassium-sparing diuretics, including amiloride, may be associated with increased serum potassium levels, consider potential effects on potassium kinetics and renal function
Documented hypersensitivity, elevated serum potassium levels (>5.5 mEq/L), impaired renal function, acute or chronic renal insufficiency, and evidence of diabetic nephropathy; monitor electrolytes closely if evidence of renal functional impairment, BUN >30 mg/100 mL, or serum creatinine levels >1.5 mg/100 mL
Pregnancy
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Precautions
Potassium retention associated with use of antikaliuretic agent accentuated in presence of renal impairment and may result in rapid development of hyperkalemia; monitor serum potassium level, mild hyperkalemia usually not associated with abnormal ECG
Spironolactone (Aldactone)
For management of edema resulting from excessive aldosterone excretion. Competes with aldosterone for receptor sites in distal renal tubules, increasing water excretion while retaining potassium and hydrogen ions.
Adult
25-200 mg/d PO bid
Pediatric
60 mg/m2/d PO q6-24h
May decrease effect of anticoagulants; potassium and potassium-sparing diuretics may increase toxicity
Documented hypersensitivity, anuria, renal failure, or hyperkalemia
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
Precautions
Caution in renal and hepatic impairment
Angiotensin II receptor blockers
These agents competitively inhibit the ability of angiotensin II to interact with and stimulate angiotensin II receptors. This action results in decreased aldosterone secretion and, consequently, decreased renal potassium excretion.
Valsartan (Diovan)
Prodrug that produces direct antagonism of angiotensin II receptors. Displaces angiotensin II from AT1 receptor and may lower blood pressure by antagonizing AT1-induced vasoconstriction, aldosterone release, catecholamine release, arginine vasopressin release, water intake, and hypertrophic responses. May induce more complete inhibition of renin-angiotensin system than ACE inhibitors, does not affect response to bradykinin, and is less likely to be associated with cough and angioedema. Can be used as alternative therapy, especially in patients unable to tolerate ACE inhibitors.
Adult
80-160 mg/d PO
Pediatric
Not established
Hyperkalemic effects can be potentiated by concomitant use of NSAIDs, ACE inhibitors, potassium supplements, potassium-sparing diuretics, or other drugs that impair renal potassium secretion; hypotensive effects can be potentiated by diuretics or other antihypertensive agents
Documented hypersensitivity; bilateral renal artery stenosis; hypotension; hyperkalemia
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Precautions
Pregnancy category D in second and third trimester; initiate therapy gradually and monitor closely in patients on drugs that can increase serum potassium level, patients on diuretics, and patients with congestive heart failure, renal insufficiency, or known renal artery stenosis
Candesartan (Atacand)
Produces direct antagonism of angiotensin II receptors. Displaces angiotensin II from AT1 receptor and may lower blood pressure by antagonizing AT1-induced vasoconstriction, aldosterone release, catecholamine release, arginine vasopressin release, water intake, and hypertrophic responses. May induce more complete inhibition of renin-angiotensin system than ACE inhibitors, does not affect response to bradykinin, and is less likely to be associated with cough and angioedema. Can be used as alternative therapy, especially in patients unable to tolerate ACE inhibitors.
Adult
4-32 mg PO qd
Pediatric
Not established
Hyperkalemic effects can be potentiated by concomitant use of NSAIDs, ACE inhibitors, potassium supplements, potassium-sparing diuretics, or other drugs that impair renal potassium secretion; hypotensive effects can be potentiated by diuretics or other antihypertensive agents
Documented hypersensitivity, bilateral renal artery stenosis; hypotension; hyperkalemia
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Precautions
Pregnancy category D in second and third trimester; initiate therapy gradually and monitor closely in patients on drugs that can increase serum potassium level, patients on diuretics, and patients with congestive heart failure, renal insufficiency, or known renal artery stenosis
Losartan (Cozaar)
Angiotensin II receptor antagonist that blocks the vasoconstrictor and aldosterone-secreting effects of angiotensin II. May induce a more complete inhibition of the renin-angiotensin system than ACE inhibitors, does not affect the response to bradykinin, and is less likely to be associated with cough and angioedema. Angiotensin II receptor antagonists can be used as alternative therapy, especially in patients who cannot tolerate ACE inhibitors.
Adult
25-100 mg PO bid
Pediatric
<6 years: Not established
6-16 years: 0.7 mg/kg qd (max 50 mg/d)
>16 years: Administer as in adults
Hyperkalemic effects can be potentiated by concomitant use of NSAIDs, ACE inhibitors, potassium supplements, potassium-sparing diuretics, or other drugs that impair renal potassium secretion; hypotensive effects can be potentiated by diuretics or other antihypertensive agents
Documented hypersensitivity; bilateral renal artery stenosis; hypotension; hyperkalemia
Pregnancy
C - Fetal risk revealed in studies in animals but not established or not studied in humans; may use if benefits outweigh risk to fetus
D - Fetal risk shown in humans; use only if benefits outweigh risk to fetus
Precautions
Pregnancy category D in second and third trimester; initiate therapy gradually and monitor closely in patients on drugs that can increase serum potassium level, patients on diuretics, and patients with congestive heart failure, renal insufficiency, or known renal artery stenosis
Selective aldosterone blockers
These agents selectively block aldosterone binding at mineralocorticoid receptors.
Eplerenone (Inspra)
Selectively blocks aldosterone at the mineralocorticoid receptors in epithelial (eg, kidney) and nonepithelial (eg, heart, blood vessels, and brain) tissues; thus, decreases blood pressure and sodium reabsorption. More selective for mineralocorticoid receptors than spironolactone, thus has lesser incidence of side effects associated with androgen antagonism, such as gynecomastia.
Adult
50 mg PO qd; may increase dose after 4 wk, not to exceed 100 mg/d
Pediatric
Not established
CYP450 3A4 substrate; potent CYP3A4 inhibitors (eg, ketoconazole) increase serum levels about 5-fold; less potent CYP3A4 inhibitors (eg, erythromycin, saquinavir, verapamil, fluconazole) increase serum levels about 2-fold; grapefruit juice increases serum levels about 25%; coadministration with potassium supplements, salt substitutes, or drugs known to increase serum potassium (eg, amiloride, spironolactone, triamterene, ACE inhibitors, angiotensin II inhibitors) increases risk of hyperkalemia
Documented hypersensitivity; hyperkalemia or coadministration with drugs causing increased potassium; type 2 diabetes with microalbuminuria; moderate-to-severe renal insufficiency (eg, CrCl <50 mL/min or serum creatinine > 2 mg/dL in males or >1.8 mg/dL in females)
Pregnancy
B - Fetal risk not confirmed in studies in humans but has been shown in some studies in animals
Precautions
May cause hyperkalemia, headache, and dizziness; caution with hepatic insufficiency
More on Hypokalemia |
| Overview: Hypokalemia |
| Differential Diagnoses & Workup: Hypokalemia |
Treatment & Medication: Hypokalemia |
| Follow-up: Hypokalemia |
| References |
| Further Reading |
| « Previous Page | Next Page » |
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Further Reading
Related eMedicine topics:
Bartter Syndrome [Nephrology]
Bartter Syndrome [Pediatrics: General Medicine]
Conn Syndrome
Hyperaldosteronism [Pediatrics: General Medicine]
Hyperaldosteronism [Radiology]
Hyperaldosteronism, Primary
Hyperkalemia [Emergency Medicine]
Hyperkalemia [Nephrology]
Hyperkalemia [Pediatrics: Cardiac Disease and Critical Care Medicine]
Hypokalemia [Emergency Medicine]
Hypokalemia [Pediatrics: Cardiac Disease and Critical Care Medicine]
VIPoma
VIPomas
Clinical guidelines:
Case detection, diagnosis, and treatment of patients with primary aldosteronism: an Endocrine Society clinical practice guideline. The Endocrine Society - Disease Specific Society. 2008 Sep. 26 pages. NGC:006766
Hyperglycemic crises in diabetes. American Diabetes Association - Professional Association. 2000 Oct (revised 2001; republished 2004 Jan). 9 pages. NGC:003428
Clinical trials:
Safety of Continuous Potassium Chloride Infusion in Critical Care (ASPIC)
Spironolactone to Decrease Potassium Wasting in Hypercalciurics on Thiazides Diuretics
Keywords
hypokalemia, low potassium, symptoms of low potassium, lack of potassium, causes of low potassium, low potassium symptoms, Bartter's syndrome, Gitelman's syndrome, Bartter syndrome, Gitelman syndrome, symptoms of hypokalemia, potassium homeostasis, potassium excretion, potassium intake
Treatment & Medication: Hypokalemia