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Pediatric Study - Safety


ALTUVIIIO has an established safety profile1

ALTUVIIIO is contraindicated in patients who have had severe hypersensitivity reactions, including anaphylaxis, to the product or its components.

Factor VIII inhibitors1

  • Inhibitor development is a known risk inherent of factor replacement therapies, including ALTUVIIIO
  • Neutralizing anti-Factor VIll antibodies (inhibitors) have been reported following administration of ALTUVIIIO in the postmarketing setting*
  • No inhibitors were reported in the Phase 3 trials
  • Monitor all patients for the development of Factor VIII inhibitors by appropriate clinical observations and laboratory tests 

Hypersensitivity reactions1

  • Allergic-type hypersensitivity reactions, including anaphylaxis, have been reported with ALTUVIIIO in the postmarketing setting*
  • No allergic-type hypersensitivity reactions were reported in the Phase 3 trials
  • Discontinue ALTUVIIIO if hypersensitivity reaction occurs and manage symptoms as appropriate

*In the postmarketing setting, reports are derived from a population of uncertain size; therefore, it is not always possible to reliably estimate frequency or establish a causal relationship to drug exposure.

Adverse reactions with frequency of >10% reported for ALTUVIIIO in the XTEND-Kids trial1

Adverse ReactionsPercentage of Patients (n) (N=74)
Pyrexia12.2% (9)

Pooled safety data: Adverse reactions with frequency of ≥3% reported for ALTUVIIIO in the Phase 3 trials1†

Adverse ReactionsPercentage of Patients (n) (N=233)
Headache15% (35)
Arthralgia13% (31)
Pain in extremity4% (10)
Pyrexia4% (10)
Back pain4% (9)
Vomiting3% (7)

Phase 3 clinical trials include XTEND-1 and XTEND-Kids.
233 subjects across the adult and adolescent and pediatric studies.1

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Discover how ALTUVIIIO performed

Learn about bleed protection for pediatric patients.

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Safety from the adult & adolescent study

Find out more about the trial with the ALTUVIIIO safety profile in the XTEND-1 clinical trial.

Indication

ALTUVIIIO® is indicated for use in adults and pediatric patients with hemophilia A (congenital factor VIII deficiency) for:

  • Routine prophylaxis to reduce the frequency of bleeding episodes
  • On-demand treatment and control of bleeding episodes
  • Perioperative management of bleeding
Limitation of Use

ALTUVIIIO is not indicated for the treatment of von Willebrand disease.

Important Safety Information

Contraindications

ALTUVIIIO is contraindicated in patients who have had severe hypersensitivity reactions, including anaphylaxis, to the product or its excipients.

Warnings and Precautions
  • Allergic-type hypersensitivity reactions, including anaphylaxis, have occurred with ALTUVIIIO. Discontinue use of ALTUVIIIO if hypersensitivity reaction occurs and manage symptoms as appropriate.
  • Formation of neutralizing antibodies (inhibitors) to Factor VIII has been reported following administration of ALTUVIIIO. Monitor all patients for the development of Factor VIII inhibitors by appropriate clinical observations and laboratory tests.
  • If assessment of plasma Factor VIII activity is needed, it is recommended to use a validated one-stage clotting assay. The ALTUVIIIO Factor VIII activity level is overestimated by the chromogenic assay and a specific ellagic acid-based aPTT reagent in one-stage clotting assay by approximately 2.5-fold. If these assays are used, divide the result by 2.5 to approximate the patient's ALTUVIIIO Factor VIII activity level.
Adverse Reactions

The most common adverse reactions (>10% of subjects) reported in clinical trials were headache and arthralgia.

Indication

Important Safety Information

Reference: 1. ALTUVIIIO Prescribing Information. Bioverativ Therapeutics Inc. Waltham, MA.

© 2026 Sanofi. All rights reserved. ALTUVIIIO, MyALTUVIIIO, and Sanofi are registered trademarks of Sanofi or an affiliate. MAT-US-2403559-v4.0-01/2026 Last Updated: January 2026