Ultipot is a slow-release potassium chloride tablet, 600 mg. It is used to treat or prevent low potassium in the blood — most often in people taking diuretics for blood pressure or heart failure. Despite where it sits on the shelf, it is a medicine rather than an ordinary supplement.
What is Ultipot?
The South African Medicine Price Registry lists Ultipot as a Schedule 2 slow-release tablet containing potassium chloride 600 mg.
This is not a general wellness supplement. Potassium is a mineral, but potassium supplementation is a medical intervention with a genuinely narrow safe range — and Schedule 2 status reflects that. It is sold through a pharmacy, and it should be taken because a blood test showed you need it, not because potassium sounds beneficial.
Potassium is the main mineral inside cells, and the body keeps blood levels within tight limits — roughly 3.5 to 5.0 mmol/L. Both ends of that range matter:
Too little (hypokalaemia) causes muscle weakness, cramps, fatigue, constipation and — the serious risk — abnormal heart rhythms.
Too much (hyperkalaemia) also causes abnormal heart rhythms, and can cause cardiac arrest. It is the more dangerous direction, and it is why potassium supplements are not something to take speculatively.
Slow-release matters here. Potassium chloride is highly irritating to the gut lining. Released all at once it can cause ulceration of the stomach or small bowel. The slow-release formulation spreads the release out, which is why these tablets must be swallowed whole — never crushed, chewed or broken.
What is Ultipot commonly used for?
- Low blood potassium (hypokalaemia), confirmed by a blood test.
- Preventing low potassium in people on diuretics — furosemide, hydrochlorothiazide, indapamide and similar. This is by far the commonest reason it is prescribed: these medicines make the kidneys excrete potassium along with sodium and water.
- Potassium loss from prolonged vomiting or diarrhoea.
- Potassium loss in certain kidney and hormonal conditions.
- People on digoxin, where low potassium makes digoxin toxicity considerably more likely.
- Correcting potassium alongside magnesium, since low magnesium often prevents potassium levels from correcting.
Not everyone on a diuretic needs it. Potassium-sparing diuretics such as spironolactone and amiloride do the opposite — they retain potassium — and taking a supplement alongside one of those can push levels dangerously high. So can ACE inhibitors and ARBs, which also raise potassium.
This is why the blood test matters. Two people on blood pressure treatment can need opposite things, and neither can tell which from how they feel.
Dietary potassium is a different matter. Bananas, potatoes, beans, spinach, avocado and dried fruit are all good sources, and for mild dietary shortfall food is the sensible route. Supplements are for measured deficiency.
Who commonly looks for Ultipot and why
- People on diuretics for blood pressure or heart failure, who have been prescribed it alongside.
- People told their potassium is low after a blood test.
- People with muscle cramps, hoping potassium is the answer — it sometimes is, and often is not.
- People with fatigue or palpitations, looking for a cause.
- Athletes, wondering about potassium for cramping.
- Older adults, who are more often on diuretics and more vulnerable in both directions.
- People who saw it beside the vitamins and assumed it was an ordinary supplement.
That last group is worth addressing directly: do not start potassium because you think you might be low. Cramps and tiredness have many causes, and potassium is one of the few minerals where guessing wrong in the upward direction is genuinely dangerous.
What to check on the label before taking Ultipot
- That it is the slow-release formulation, and how many tablets a dose is.
- That you have had a blood test confirming you need it, and know when the next one is.
- Everything else you take that affects potassium — ACE inhibitors, ARBs, potassium-sparing diuretics, and salt substitutes, which are frequently potassium chloride and are a genuinely underappreciated source.
- Whether your magnesium has been checked, since low magnesium prevents potassium correcting.
- The expiry date, and that tablets are intact.
Taking it:
- Swallow whole with a full glass of water. Never crush, chew or split.
- Take it with or after food, sitting or standing upright — not lying down, and not immediately before bed.
- Do not take it with a salt substitute unless your doctor knows.
- Do not double up on a missed dose.
- Keep your blood tests.
Safety, interactions and when to seek professional advice
Speak to a doctor before taking potassium at all if you:
- Have kidney disease, or reduced kidney function. This is the most important contraindication — the kidneys are how excess potassium leaves the body, and when they are impaired, potassium accumulates.
- Take ACE inhibitors (enalapril, perindopril), ARBs (losartan, telmisartan), or potassium-sparing diuretics (spironolactone, amiloride, eplerenone). All raise potassium.
- Take trimethoprim or co-trimoxazole, heparin, ciclosporin, or regular anti-inflammatories.
- Have Addison’s disease, untreated adrenal insufficiency, or severe dehydration.
- Have a narrowing or motility problem in the gut, or difficulty swallowing.
- Have an active stomach ulcer.
- Are pregnant or breastfeeding.
Common side effects are nausea, vomiting, abdominal discomfort, wind and diarrhoea — mostly from gut irritation, and reduced by taking the tablets with food and plenty of water.
Get emergency help immediately for signs of high potassium, which can be fatal:
- Palpitations, or a slow, fast or irregular heartbeat
- Muscle weakness, or a heavy feeling in the limbs
- Numbness or tingling, especially around the mouth
- Confusion, or unusual difficulty breathing
- Collapse
Also seek urgent help for severe abdominal pain, vomiting blood, or black tarry stools — potassium chloride can ulcerate the gut, particularly if a tablet has been crushed or has lodged.
Contact your doctor if you develop vomiting or diarrhoea and cannot take tablets normally, if you become dehydrated, if your kidney function changes, if another prescriber starts you on a new medicine, or if you are still cramping despite treatment — magnesium may be the missing part.
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Frequently asked questions
What is Ultipot 600 mg used for? Treating or preventing low blood potassium, most often in people taking diuretics for blood pressure or heart failure. It contains slow-release potassium chloride 600 mg.
Is it a supplement or a medicine? It is a Schedule 2 medicine. Potassium supplementation has a narrow safe range and should follow a blood test, not a guess.
Can I take it for muscle cramps? Only if a blood test shows your potassium is low. Cramps have many causes, and magnesium is often the more relevant one.
Can I crush or split the tablet? No. Never. Slow release is what protects the gut lining; crushing it releases the whole dose at once and can cause ulceration.
Can I take it with my blood pressure tablets? Ask your doctor. ACE inhibitors, ARBs and potassium-sparing diuretics all raise potassium, and adding a supplement can push it dangerously high.
Can I use a salt substitute as well? Tell your doctor first — most salt substitutes are potassium chloride, and they add to your intake without anyone counting it.
Why do I need blood tests? Because both low and high potassium cause dangerous heart rhythms, and neither can be judged by how you feel.
Can I just eat bananas instead? For mild dietary shortfall, food is the sensible route. Measured deficiency needs measured replacement.