Ferinject (ferric carboxymaltose) is widely used and often very effective. However, it can cause low phosphate (hypophosphataemia) in some people. For this reason, monitoring may be recommended in certain situations.
What is phosphate, and why does it matter?
Phosphate supports:
- Muscle function
- Energy metabolism
- Bone mineralisation
What symptoms can low phosphate cause?
Symptoms vary. Examples include:
- Worsening fatigue
- Muscle aches (myalgias)
- Bone pain
- Weakness
If symptoms are severe or progressive, seek medical assessment.
Why is this discussed more with Ferinject?
National safety communications and product information highlight rare but clinically significant cases of hypophosphataemia leading to osteomalacia and fractures.
Who is more likely to need phosphate monitoring?
Monitoring is more likely to be recommended if a patient:
- needs multiple administrations at higher doses
- is receiving long-term treatment
- has risk factors for low phosphate (e.g., malabsorption conditions)
Our approach at The Health Suite (14–18 pathway)
Because our young people’s pathway is specialist-led, we:
- Assess phosphate risk at consultation
- Consider baseline phosphate testing
- Advise follow-up testing where clinically indicated
- Provide clear aftercare guidance on symptoms to report
Why this matters for parents/guardians
For most young people, IV iron is straightforward and well-tolerated. The goal of monitoring is to keep treatment safe and to identify rare issues early.