Wezenla

Wezenla 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 that Wezenla is used for.

In plaque psoriasis and psoriatic arthritis, Wezenla is injected under the skin. For adults the usual dose is 45 mg, whereas in children with plaque psoriasis the dose depends on their bodyweight. The dose in patients weighing over 100 kg is 90 mg for psoriasis, and this dose may also be considered for psoriatic arthritis. 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 Wezenla infusion (drip) into a vein over at least 1 hour. The dose depends on the patient’s bodyweight. Eight weeks after the first infusion, a dose of 90 mg is injected under the skin. Patients then continue with Wezenla injected under the skin every 8 or 12 weeks depending on how well the treatment is working.

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

The active substance in Wezenla, 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.

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

In addition, a study in 563 patients with moderate to severe plaque psoriasis showed that Wezenla was as effective as Stelara in treating this condition. After 12 weeks improvement in symptom scores (PASI) was around 82% in patients given either of these medicines.

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

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

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

The safety of Wezenla 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 Wezenla, see the package leaflet.

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

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

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

Wezenla received a marketing authorisation valid throughout the EU on 20 June 2024.