Hypokalemia

Serum potassium level falling below 3.5 mEq/L.

Written by: Saygı Hospital Health Guide Editorial Board

Last updated: June 9, 2026

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Dahiliye (İç Hastalıkları) department. Book Appointment →

What is Hypokalemia?

Hypokalemia is the fall of serum potassium level below 3.5 mEq/L. It is classified as mild (3.0-3.5), moderate (2.5-3.0), and severe (<2.5 mEq/L). Severe cases can lead to life-threatening arrhythmias.

The most common causes are diuretic use (especially loop and thiazide), gastrointestinal losses (vomiting, diarrhea, laxative abuse), primary hyperaldosteronism, and intracellular shift (insulin, beta-agonists, hypokalemic periodic paralysis).

Magnesium deficiency must be corrected together when potassium replacement is performed; otherwise hypokalemia cannot be easily corrected.

Symptoms

Muscle weakness and cramps

Fatigue and weakness

Constipation and ileus

Palpitations and arrhythmias

Polyuria and polydipsia

U wave, ST depression, prolonged QT on ECG

Rhabdomyolysis (in severe cases)

Risk Factors

Thiazide and loop diuretic use

Chronic vomiting and diarrhea

Laxative abuse

Primary hyperaldosteronism

Diabetic ketoacidosis treatment

Excessive licorice consumption

Bulimia nervosa

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

If there is severe muscle weakness on diuretics
If palpitations and irregular heartbeat occur
Weakness after recurrent vomiting and diarrhea
When ECG change is detected
If paralysis develops (urgent)

Treatment Methods

Oral potassium chloride tablets in mild cases

IV potassium in moderate-severe cases (safe rate: 10 mEq/hour peripheral)

Mg replacement if magnesium deficiency accompanies

Correction of underlying cause (drug, hyperaldosteronism)

Potassium-rich nutrition (banana, orange, spinach, potato)

Diuretic change: addition of potassium-sparing diuretic

Which Department to Visit?

You can visit our Dahiliye (İç Hastalıkları) department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Dahiliye (İç Hastalıkları) Department

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You can make an appointment with our specialists or contact us for your concerns.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.