What it does
Potassium is an important mineral that helps maintain proper body function, including nerve and muscle function.
Commonly used for: low potassium levels (hypokalemia), heart conditions
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Source: Pharmacy and Poisons Board · fetched 2026-01-28 20:46:19 · updated 2026-07-26 11:36:53
About this medicine
Potassium is an important mineral that helps maintain proper body function, including nerve and muscle function.
What it treats
- low potassium levels (hypokalemia)
- heart conditions
How it works
Potassium helps regulate the balance of fluids in the body, supports muscle contractions, and is essential for normal heart function.
Who it's for
People with low potassium levels or those needing extra potassium due to certain health conditions.
Cautions
- • Too much potassium can cause serious heart problems.
- • Consult a healthcare professional if you have kidney issues.
AI-assisted summary grounded in BNF data - general information only, not medical advice. Always confirm with your pharmacist or doctor.
Clinical monograph: ptoassium
Potassium is an essential electrolyte that plays a critical role in various physiological functions, including maintaining normal cell function, nerve transmission, muscle contraction, and acid-base balance. It is primarily found in intracellular fluid and is vital for the proper functioning of the heart and skeletal muscles.
Indications
- Hypokalemia (low potassium levels)
- Management of certain arrhythmias
- Potassium supplementation in patients receiving diuretics or those with gastrointestinal losses
Dosage
Children: Refer to the BNF for Children for specific dosing recommendations.
Adults: Refer to the appropriate clinical guidelines or BNF for specific dosing recommendations.
Mechanism of action
Potassium ions are involved in the generation and conduction of electrical impulses in nerve and muscle cells. They help establish the resting membrane potential and are crucial for repolarization during action potentials. Potassium works by competing with sodium in excitable tissues, influencing cellular excitability and contractility.
Pharmacodynamics
Potassium has a direct effect on cardiac muscle contraction, influencing heart rate and rhythm. It modulates the excitability of neurons and muscle fibers, ensuring proper muscle function and coordination. Hypokalemia (low potassium levels) can lead to muscle weakness, cramps, and arrhythmias, while hyperkalemia (high potassium levels) can result in potentially life-threatening cardiac dysrhythmias.
Pharmacokinetics
Potassium is absorbed in the gastrointestinal tract, primarily in the small intestine. It is distributed throughout the body, with the majority found intracellularly. The kidneys play a key role in maintaining potassium homeostasis through filtration and secretion. The half-life of potassium varies based on renal function and dietary intake, and it is primarily excreted through the urine.
Contra-indications
- Hyperkalemia
- Severe renal impairment
- Adrenal insufficiency
Adverse effects
- Hyperkalemia
- Gastrointestinal discomfort
- Nausea
- Vomiting
- Diarrhea
- Cardiac arrhythmias
Interactions
- Potassium-sparing diuretics may increase potassium levels
- ACE inhibitors may increase the risk of hyperkalemia
- NSAIDs may reduce renal function and increase potassium levels
Precautions
- Use with caution in patients with renal disease
- Monitor serum potassium levels regularly
- Consider potential drug interactions with other medications affecting potassium levels
Pregnancy
Potassium is generally considered safe in pregnancy, but should be used under medical supervision to avoid complications.
Breast-feeding
Potassium is excreted in breast milk; however, normal dietary intake is not expected to cause adverse effects in breastfeeding infants.
Storage
Store at room temperature, away from moisture and heat. Keep out of reach of children.
Formulations
- Oral tablets
- Effervescent tablets
- Liquid preparations
- Intravenous formulations
AI-synthesized from BNF references - general information only, not a substitute for professional medical advice or the current BNF. Verify doses with a pharmacist.