potassium chloride at a glance
Medicine class
Potassium supplement and electrolyte replacement.
Main use
Treatment of hypokalaemia and potassium deficiency.
Administration
The selected syrup is taken by mouth after food, following the prescription label.
Monitoring
Blood electrolytes and sometimes an ECG are checked during replacement therapy.
What is potassium chloride used for?
The selected UK product is licensed for:
Treatment of hypokalaemia, meaning a low blood-potassium concentration.
Treatment of potassium deficiency arising from renal losses or causes outside the kidneys.
How does potassium chloride work?
Potassium is the main positively charged ion inside cells. It supports nerve signalling, skeletal and heart-muscle activity, enzyme function and fluid balance. Potassium chloride supplies potassium and chloride ions, helping restore depleted body stores and normal cellular electrical activity.
potassium chloride preparations and strengths
Syrup
Route: Oral
Strengths: 7.5% w/v
How to take potassium chloride
Take the oral syrup exactly as shown on the dispensing label.
Take the syrup after food to reduce stomach irritation.
Measure liquid with the supplied or recommended oral measuring device, not a household spoon.
Do not use oral syrup as an injectable product.
Check with a pharmacist if the product, concentration or measuring device changes.
potassium chloride side effects
Common or expected effects
- Abdominal discomfort or cramps
- Nausea or vomiting
- Diarrhoea
- Stomach irritation
Get urgent medical advice
- Allergic reaction with wheezing, breathing difficulty, swelling, rash or widespread itching
- Gastrointestinal ulceration, bleeding, narrowing or obstruction
- Hyperkalaemia, which may cause weakness, tingling, confusion, paralysis or abnormal heart rhythms
potassium chloride in pregnancy
The selected syrup should be used during pregnancy only when the prescriber considers it essential. Potassium status, kidney function and the reason for replacement should be assessed; do not start or stop it without discussing this with the maternity or prescribing team.
potassium chloride while breastfeeding
The selected syrup should be used while breastfeeding only when the prescriber considers it essential. Discuss the need for treatment and appropriate monitoring with the prescribing or maternity team.
potassium chloride interactions
Medicines that retain potassium can increase the risk of hyperkalaemia, especially when kidney function is reduced.
ACE inhibitors
Medicines such as enalapril can increase blood potassium; concurrent use requires clinical review and monitoring.
Angiotensin II receptor blockers
Medicines such as losartan can add to the potassium-raising effect.
Potassium-sparing diuretics and aldosterone antagonists
Medicines such as amiloride or spironolactone can substantially increase the risk of hyperkalaemia.
Common questions about potassium chloride
Answers are fully visible for fast scanning and source review.
What is potassium chloride used for?
It replaces potassium when blood concentrations or body stores are too low. The selected syrup is licensed for hypokalaemia and potassium deficiency from renal or non-renal causes.
Why must potassium chloride be taken after food?
Food dilutes the syrup in the gastrointestinal tract and can reduce stomach irritation.
Can potassium chloride syrup be measured with a kitchen spoon?
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.