WHAT IS THIS MEDICINE AND WHAT IS IT USED FOR?
Phosphate Sandoz contains a combination of phosphate salts in an
effervescent (dissolving) tablet form that is taken as a drink. Phosphate is an
essential mineral involved in bone formation, energy production, kidney
function, and the regulation of many biological processes.
Hypophosphataemia (low phosphate in the blood) can occur in several
situations: refeeding syndrome — when nutrition is restarted after a period of
starvation or very poor intake (phosphate rushes into cells, depleting blood
levels); hyperparathyroidism — overactive parathyroid glands cause the kidneys
to waste phosphate; certain kidney disorders causing phosphate wasting; vitamin
D deficiency (leading to conditions like osteomalacia — soft, weak bones in
adults); prolonged use of phosphate-binding antacids (aluminium or magnesium
hydroxide antacids bind phosphate in the gut, reducing absorption); and
hereditary phosphate-wasting conditions such as X-linked hypophosphataemia.
Phosphate Sandoz replaces the deficit and corrects the blood phosphate
level.
3. HOW TO TAKE THIS MEDICINE
The usual adult dose is 2 to 4 tablets dissolved in a glass of water,
taken 2 to 4 times daily with or without food, depending on the degree of
deficiency. Always dissolve each tablet completely in a large glass of water
(approximately 200mL) before drinking — do not swallow undissolved tablets.
Dose adjustments are made based on blood phosphate levels and your
doctor's assessment. In refeeding syndrome, dosing is closely monitored and
adjusted daily based on blood results.
Each effervescent tablet contains sodium and potassium as well as
phosphate. Patients on sodium-restricted diets (such as those with high blood
pressure, heart failure, or chronic kidney disease) should be aware of the
sodium content. Similarly, patients with kidney problems need careful
monitoring because the kidneys control phosphate elimination — taking phosphate
supplements with reduced kidney function can lead to dangerous phosphate
accumulation.
⚠ PATIENT TIP: Dissolve the tablet fully in
water and drink it while it is still fizzing — this improves palatability.
Drinking it through a straw can reduce the impact on tooth enamel (due to the
mild acidity of the effervescent tablet). Follow with a glass of plain water.
4. POSSIBLE SIDE EFFECTS
|
How Common? |
Side Effects |
|
Common |
Nausea, stomach
discomfort, diarrhoea, loose stools — these are common with oral phosphate
supplements, particularly at higher doses. Taking with or just after food
usually helps. |
|
Less Common |
Flatulence (wind),
stomach cramping |
|
Serious — Tell Your
Doctor |
Symptoms of too much
phosphate (hyperphosphataemia) — particularly in patients with kidney
disease: itching, bone and joint pain, calcium deposits in soft tissues.
Symptoms of low calcium (hypocalcaemia) — phosphate supplementation can lower
calcium levels: muscle cramps, tingling around the mouth or in the fingers,
muscle spasms or twitching (tetany). Signs of too much potassium
(hyperkalaemia) if taking potassium-containing phosphate preparations in
patients with kidney impairment: muscle weakness, palpitations. |
5. WHO SHOULD NOT TAKE THIS MEDICINE
Phosphate Sandoz should be used with great caution in patients with
reduced kidney function — phosphate accumulates when the kidneys cannot excrete
it efficiently, potentially causing serious calcium and phosphate imbalances.
It must not be used in patients with already high phosphate levels
(hyperphosphataemia) or high calcium levels (hypercalcaemia). Use with caution
in patients on low-sodium diets (heart failure, hypertension, certain kidney
conditions) due to the sodium content of these tablets.
⚠ KIDNEY FUNCTION: Renal impairment
significantly increases the risk of phosphate accumulation
(hyperphosphataemia), which can cause calcification of soft tissues and worsen
kidney function. Blood phosphate, calcium, and creatinine should be monitored
during supplementation — especially in patients with any degree of renal
impairment.
⚠ CALCIUM LEVELS: As blood phosphate rises,
calcium can be displaced and fall — causing hypocalcaemia (low blood calcium),
which causes muscle cramps, tingling, and in severe cases muscle spasms
(tetany). Monitor calcium alongside phosphate.
⚠ REFEEDING SYNDROME: In the management of
refeeding syndrome, phosphate levels can change rapidly. Monitoring must be
frequent (often daily or twice daily) and dose adjustments should be made
accordingly by the clinical team.
6. MEDICINES THAT INTERACT WITH THIS TREATMENT
Antacids containing aluminium or magnesium (such as Gaviscon, Maalox, or
similar products) bind phosphate in the gut and significantly reduce phosphate
absorption — separate doses by at least 2 hours or avoid concurrent use.
Calcium-based antacids similarly bind phosphate. Vitamin D analogues may affect
calcium and phosphate metabolism — monitor levels. ACE inhibitors, ARBs, and
potassium-sparing diuretics can raise potassium levels — combined with the
potassium in Phosphate Sandoz, hyperkalaemia risk increases in renally impaired
patients.
7. HOW TO STORE THIS MEDICINE
Store below 25°C in a dry place. Keep the tube tightly closed to protect
from moisture — moisture causes the tablets to fizz and deteriorate. Keep out
of reach of children.
8. PRESCRIPTION REQUIREMENT
|
Field |
Details |
|
Status |
Prescription Only
Medicine (POM) — prescribed by GPs, hospital physicians, or specialist teams
depending on indication |
9. GUIDANCE FOR PATIENTS & CAREGIVERS
Dissolve each tablet completely in a large glass of water (about 200mL)
before drinking. Take with or just after food to reduce nausea and stomach
discomfort. If you are taking antacids, separate them from your phosphate dose
by at least 2 hours — antacids can bind phosphate and stop it being absorbed.
Attend all blood test appointments — your phosphate and calcium levels need to
be checked regularly to ensure the dose is correct. Report any muscle cramps,
tingling around the mouth, muscle twitching, or unusual fatigue to your doctor
promptly.
10. PHARMACIST & PRESCRIBER NOTES
|
Field |
Details |
|
Clinical Dispensing
Notes |
Effervescent phosphate
supplement — each tablet provides 500mg phosphate plus sodium and potassium.
Monitor sodium load in patients with HF, hypertension, or oedema. Renal
impairment: significant caution and close monitoring of phosphate, calcium,
and creatinine required — hyperphosphataemia risk is real and serious.
Calcium monitoring alongside phosphate: hypocalcaemia can occur as phosphate
rises. For refeeding syndrome: daily or twice-daily monitoring of
electrolytes (phosphate, potassium, magnesium, calcium, sodium) required —
dose adjustments are frequent and rapid. Aluminium/magnesium antacid
interaction: separate by minimum 2 hours or prescribe an alternative.
Potassium content: relevant in CKD, ACE inhibitor/ARB or K+-sparing diuretic
users. Counsel on dissolution in full glass of water before drinking. |
11. FREQUENTLY ASKED QUESTIONS
Q: What is refeeding syndrome?
When someone who has been very poorly nourished (due to illness, eating
disorders, or prolonged fasting) starts receiving nutrition again, the body
suddenly demands large amounts of phosphate to process the incoming energy.
This causes blood phosphate to drop sharply — which can affect the heart,
breathing muscles, and nervous system. Phosphate replacement is a key part of
safe refeeding, and levels are monitored very carefully.
Q: Why do I need blood tests while taking this?
Because both too little and too much phosphate can be harmful. Blood
tests monitor your phosphate level so the dose can be adjusted to keep it
within the normal range. In kidney disease, there is a particular risk of
phosphate accumulating to dangerous levels.
Q: My antacid is at the same time — does it matter?
Yes — antacids containing aluminium or magnesium (like Gaviscon, Maalox,
or similar) bind phosphate in the gut and prevent it from being absorbed. You
should separate your antacid and phosphate tablet by at least 2 hours to get
the full benefit of the supplement.
Q: Why does it contain sodium and potassium as well as phosphate?
The phosphate is formulated as sodium acid phosphate and potassium
bicarbonate salts — these carrier components are what create the effervescent
reaction. Patients who need to limit sodium or potassium intake (such as those
with heart failure, high blood pressure, or kidney disease) should let their
doctor know.