Fymskina

Laboratory studies comparing Fymskina with Stelara have shown that the active substance in Fymskina is highly similar to that in Stelara in terms of structure, purity and biological activity. Studies have also shown that giving Fymskina produces similar levels of the active substance in the body to giving Stelara.

In addition, a study of 392 patients with moderate to severe plaque psoriasis showed that Fymskina was as effective as Stelara in improving symptoms. The improvement in symptoms scores after 12 weeks was similar with both medicines.

Because Fymskina is a biosimilar medicine, the studies on effectiveness of ustekinumab carried out with Stelara do not all need to be repeated for Fymskina.

The safety of Fymskina has been evaluated and, on the basis of all the studies carried out, the side effects of the medicine are considered to be comparable to those of the reference medicine Stelara.

For the complete list of side effects and restrictions of Fymskina, see the package leaflet.

The most common side effects with ustekinumab (seen in more than 1 in 20) include headache and nasopharyngitis (inflammation of the nose and throat). The most serious side effect reported with ustekinumab include serious hypersensitivity (allergic reaction).

Fymskina must not be used in patients who have an active infection that the doctor considers important.

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

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

Fymskina received a marketing authorisation valid throughout the EU on 25 September 2024.

Fymskina can only be obtained with a prescription and should be given under the supervision of a doctor who has experience in diagnosing and treating the diseases it is used for.

In plaque psoriasis and psoriatic arthritis, Fymskina is injected under the skin. The first injection is followed by a further injection 4 weeks later, and then an injection every 12 weeks.

In Crohn’s disease, treatment is started with Fymskina infusion (drip) into a vein over at least 1 hour. Eight weeks after the first infusion, Fymskina is injected under the skin. Patients then continue with Fymskina injected under the skin every 8 or 12 weeks depending on how well the treatment is working.

Patients or their caregivers may inject Fymskina under the skin once they have been trained, if their doctor thinks that this is appropriate. For more information about using Fymskina, see the package leaflet or contact your doctor or pharmacist.

The active substance in Fymskina, ustekinumab, is a monoclonal antibody, a type of protein that has been designed to recognise and attach to a specific target in the body. Ustekinumab attaches to 2 messenger molecules in the immune system called interleukin 12 and interleukin 23. Both are involved in inflammation and other processes that are important in psoriasis, psoriatic arthritis and Crohn’s disease. By blocking their activity, ustekinumab reduces the activity of the immune system and the symptoms of the disease.

The European Medicines Agency decided that, in accordance with EU requirements for biosimilar medicines, Fymskina has a highly similar structure, purity and biological activity to Stelara and is distributed in the body in the same way. In addition, a study in plaque psoriasis has shown that Fymskina and Stelara are equivalent in terms of safety and effectiveness in this condition.

All these data were considered sufficient to conclude that Fymskina will have the same effects as Stelara in its authorised uses. Therefore, the Agency’s view was that, as for Stelara, the benefits of Fymskina outweigh the identified risks and it can be authorised for use in the EU.