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Pegylated recombinant alpha-galactosidase A (enzyme replacement) Pregnancy: No available data in pregnant patients to evaluate drug-associated risk; however, as an enzyme replacement it is not expected to cause adverse outcomes. Animal reproduction studies showed no adverse embryofetal effects in rats and maternal toxicity in rabbits. A pregnancy safety study exists (US label §8.1).

Pegunigalsidase alfa

Brand names: Elfabrio

Pegunigalsidase alfa is a pegylated recombinant human alpha-galactosidase A enzyme replacement therapy used for the long-term treatment of adults with Fabry disease.

Auto-extracted from the source labelling — not yet independently clinician-verified. These values were distilled from the UK SPC (or the US label where noted) but have not had a clinician sign-off. Confirm against the current SmPC before prescribing.

Adult dose

Dose: 1 mg/kg based on actual body weight
Route: Intravenous infusion (dilute in 0.9% Sodium Chloride Injection; administer through an in-line low protein-binding 0.2 micron filter)
Frequency: Every 2 weeks
No UK SPC was retrieved — dose taken from the US prescribing information for ELFABRIO (pegunigalsidase alfa-iwxj); verify against the UK SPC before use. Total infusion volume and the infusion rates for the initial 4-6 infusions are based on actual body weight and differ for ERT-experienced (Table 1) and ERT-naive (Table 2) patients — consult the full prescribing information. If the initial 4-6 infusions are tolerated, the duration of every third infusion may be decreased in decrements of 30 minutes as tolerated. Pretreatment: in ERT-experienced patients who received antihistamines, antipyretics and/or corticosteroids before previous ERT, consider similar pretreatment before the first several infusions, with stepwise reduction/discontinuation after 4-6 tolerated infusions; in ERT-naive patients pretreatment may be considered. Appropriate medical support including cardiopulmonary resuscitation equipment should be readily available during administration. Missed doses: restart as soon as possible, maintaining the 2-week interval thereafter — do not double a dose. Hypersensitivity/infusion-associated reactions: for severe reactions discontinue immediately and treat; for mild to moderate reactions consider holding the infusion for 15-30 minutes or slowing the rate by 25-50%, then resuming at a 25-50% reduced rate as tolerated, increasing by 25% every third infusion until the previous rate is reached. Monitor serum creatinine and urine protein:creatinine ratio (membranoproliferative glomerulonephritis reported).

Dose auto-extracted from US FDA prescribing information (openFDA / DailyMed) — cross-check; US labelling may differ from UK — not yet clinician-verified. Always confirm against the product SmPC and your local formulary before prescribing.

Contraindications

  • None stated (US label §4: 'None')

Side effects

  • Infusion-associated reactions
  • Nasopharyngitis and sinusitis
  • Headache
  • Diarrhoea and nausea
  • Fatigue
  • Back pain and pain in extremity
  • Hypersensitivity reactions including anaphylaxis (14% hypersensitivity, 3% anaphylaxis in clinical trials); membranoproliferative glomerulonephritis

Clinical monograph

How it works

It replaces deficient alpha-galactosidase A activity, hydrolysing accumulated globotriaosylceramide and related glycosphingolipids in affected tissues.

Prescribing in practice

  • Hypersensitivity and infusion-associated reactions, including anaphylaxis, can occur; administer under appropriate supervision with resuscitation facilities available.
  • It is given by intravenous infusion at regular intervals; refer to the SPC for administration and infusion-rate guidance.
  • Anti-drug antibodies may develop and can affect tolerability, so reactions should be documented and managed accordingly.

Monitoring

Patients are monitored during and after infusions for hypersensitivity, with ongoing review of Fabry disease parameters and antibody status as clinically indicated.

Counselling the patient

  • This treatment is given as a regular drip and is a long-term therapy for Fabry disease.
  • Report any rash, breathing difficulty, flushing or feeling unwell during or after an infusion.
  • Attend scheduled appointments so your condition and response can be reviewed.

Evidence & guidelines

Approval was based on clinical trials in Fabry disease evaluating efficacy and safety against established enzyme replacement comparators.

Reference: NICE HST evaluation; BIMDG (British Inherited Metabolic Disease Group) Fabry guidelines; SmPC; Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. The structured dose values shown have been reviewed by a clinician. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.