Strensiq

asfotase alfa

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An overview of Strensiq and why it is authorised in the EU

Strensiq is a medicine used long-term to treat patients with hypophosphatasia that started in childhood. Hypophosphatasia is a rare inherited disease of the bones which can lead to early loss of teeth, malformed bones, frequent bone fractures, and difficulty breathing.

Strensiq contains the active substance asfotase alfa.

Hypophosphatasia is rare, and Strensiq was designated an ‘orphan medicine’ (a medicine used in rare diseases) on 3 December 2008.

How is Strensiq used?

Strensiq can only be obtained with a prescription and treatment should be started by a doctor who is experienced in managing metabolic or bone disorders.

The medicine is available as a solution for injection in vials of different strengths and volumes. It is given by injection under the skin either six times a week (in a dose of 1 mg per kilogram bodyweight) or three times a week (in a dose of 2 mg/kg). As the amount given depends on the individual’s bodyweight, the doctor will need to adjust the dose as patient’s weight changes, particularly in growing children.

For more information about using Strensiq, see the package leaflet or contact your doctor or pharmacist.

How does Strensiq work?

Hypophosphatasia is caused by defects in the gene responsible for producing ‘tissue non-specific alkaline phosphatase’ (ALP), an enzyme that plays a key role in creating and maintaining healthy bones, and managing calcium and phosphate in the body. Patients with hypophosphatasia do not have enough normally functioning ALP, which leads to weak bones. Asfotase alfa, the active substance in Strensiq, is a modified copy of the human ALP enzyme and serves as a replacement for the defective enzyme, thereby increasing levels of functioning ALP.

What benefits of Strensiq have been shown in studies?

Strensiq has been studied in one main study in 13 children between 6 and 12 years of age. Patients were given either 2 mg/kg or 3 mg/kg Strensiq three times a week for 24 weeks. The main measure to indicate effectiveness of the medicine was the improvement in x-ray appearance of the wrists and knee joints of patients before and after treatment with Strensiq. X-rays of children given Strensiq were also compared with similar x-rays available from 16 children who had not received Strensiq (‘historical controls’). The study also looked at other measures of effectiveness such as growth in height. This study showed that children given Strensiq had an improvement in their joint structure as demonstrated by x-rays and most of them seemed to gain in height. In the historical controls, most children did not experience similar improvements in their joints or gain in height over a comparable period of time. Additional data from an extension of this study in children aged 13 to 18 years confirmed the initial results.

The effectiveness of Strensiq was also generally supported by several additional small studies. Some of the studies also looked at the dose of 1 mg/kg Strensiq given six times a week.

What are the risks associated with Strensiq?

The most common side effects with Strensiq (which may affect more than 1 in 10 people) are headache, erythema (reddening of the skin), pain in arms and legs, fever, irritability, injection site reactions (such as pain, rash and itching) and contusion (bruising). For the full list of side effects and restrictions with Strensiq, see the package leaflet.

Why is Strensiq authorised in the EU?

The European Medicines Agency decided that Strensiq’s benefits are greater than its risks and it be authorised for use in the EU.

The Agency noted that hypophosphatasia is a serious and life-threatening disease for which no treatment is authorised. Although the main study was small and did not directly compare Strensiq with another treatment or with untreated patients, the Agency considered that the improvement seen in the bones and the apparent growth was relevant. Given that hypophosphatasia is an extremely rare disease, data in this population will likely remain limited. Regarding safety, injection site reactions and other side effects were considered manageable with the recommendations in place.

Strensiq has been authorised under ‘exceptional circumstances’. This is because it has not been possible to obtain complete information about Strensiq due to the rarity of the disease. Every year, the Agency will review any new information that becomes available and this overview will be updated as necessary.

What information is still awaited for Strensiq?

Since Strensiq has been authorised under exceptional circumstances, the company that markets Strensiq will set up a registry of patients with hypophosphatasia to collect information on the disease and on the long-term safety and effectiveness of Strensiq.

What measures are being taken to ensure the safe and effective use of Strensiq?

The company that markets Strensiq will provide patients and carers with educational materials to ensure that the medicine is used correctly and to minimise the risk of medication errors. This material will include a self-injection guide for patients, as well as an injection guide for parents or caregivers of children with the condition.

The company will also carry out a study to explore how adult patients respond to the dose of Strensiq given to children.

Recommendations and precautions to be followed by healthcare professionals and patients for the safe and effective use of Strensiq have also been included in the summary of product characteristics and the package leaflet.

As for all medicines, data on the use of Strensiq is continuously monitored. Side effects reported with Strensiq are carefully evaluated and any necessary action taken to protect patients.

Other information about Strensiq

Strensiq received a marketing authorisation valid throughout the EU on 28 August 2015.

Name Language First published Last updated
Strensiq : EPAR - Medicine overview BG = bălgarski 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview ES = español 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview CS = čeština 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview DA = dansk 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview DE = Deutsch 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview ET = eesti keel 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview EL = elliniká 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview FR = français 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview IT = italiano 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview LV = latviešu valoda 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview LT = lietuvių kalba 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview HU = magyar 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview MT = Malti 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview NL = Nederlands 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview PL = polski 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview PT = português 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview RO = română 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview SK = slovenčina 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview SL = slovenščina 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview FI = suomi 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview SV = svenska 2015-09-28 2018-04-04
Strensiq : EPAR - Medicine overview HR = Hrvatski 2015-09-28 2018-04-04
Name Language First published Last updated
Strensiq : EPAR - Risk-management-plan summary (English only) 2015-09-28  

This EPAR was last updated on 04/04/2018 .

Authorisation details

Product details

Product details for Strensiq
NameStrensiq
Agency product numberEMEA/H/C/003794
Active substance

asfotase alfa

International non-proprietary name (INN) or common name

asfotase alfa

Therapeutic area Hypophosphatasia
Anatomical therapeutic chemical (ATC) code A16AB
Additional monitoring

This medicine is under additional monitoring. This means that it is being monitored even more intensively than other medicines. For more information, see medicines under additional monitoring.

Treatment of rare diseases

This medicine has an "orphan designation" which means that it is used to treat life-threatening or chronically debilitating conditions that affect no more than five in 10,000 people in the European Union, or are medicines which, for economic reasons, would be unlikely to be developed without incentives.

Exceptional Circumstances

There were "exceptional circumstances" concerning the approval of this medicine. This happens when the applicant can show that they are unable to provide comprehensive data on the efficacy and safety of the medicine for which authorisation is being sought, due to the rarity of the condition it is intended for, limited scientific knowledge in the area concerned, or ethical considerations involved in the collection of such data.

Publication details

Publication details for Strensiq
Marketing-authorisation holder

Alexion Europe SAS

Revision6
Date of issue of marketing authorisation valid throughout the European Union28/08/2015

Contact address:

Alexion Europe SAS
1-15 avenue Edouard Belin
92500 Rueil Malmaison
France

Product information

Product information

25/01/2018  Strensiq -EMEA/H/C/003794 -II/0019/G

Name Language First published Last updated
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04
Strensiq : EPAR - Product Information EN = English 2015-09-28 2018-04-04

Contents

  • Annex I - Summary of product characteristics
  • Annex IIA - Manufacturing-authorisation holder responsible for batch release
  • Annex IIB - Conditions of the marketing authorisation
  • Annex IIIA - Labelling
  • Annex IIIB - Package leaflet

Please note that the size of the above document can exceed 50 pages.

You are therefore advised to be selective about which sections or pages you wish to print.


Name Language First published Last updated
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  
Strensiq : EPAR - All Authorised presentations EN = English 2015-09-28  

Pharmacotherapeutic group

Other alimentary tract and metabolism products

Therapeutic indication

Strensiq is indicated for long-term enzyme replacement therapy in patients with paediatric-onset hypophosphatasia to treat the bone manifestations of the disease.

Assessment History

Changes since initial authorisation of medicine

Name Language First published Last updated
Strensiq : EPAR - Procedural steps taken and scientific information after authorisation EN = English 2015-12-09 2018-04-04
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  
Strensiq : EPAR - Scientific Conclusion EN = English 2015-09-28  

Initial marketing-authorisation documents

Name Language First published Last updated
Strensiq : EPAR - Public assessment report EN = English 2015-09-28  
CHMP summary of positive opinion for Strensiq EN = English 2015-06-25  

Authorised

This medicine is approved for use in the European Union

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