Dupixent

Dupixent is available as pre-filled pens or syringes of various strengths containing dupilumab in a solution for injection under the skin, usually in the thigh or belly. Higher doses are given as 2 injections in 2 different sites. The dose depends on the patient’s age and weight, and the condition being treated.

Dupixent can only be obtained with a prescription and treatment should be started by a doctor who has experience in the diagnosis and treatment of the conditions Dupixent is used to treat. Patients or their carers may inject the medicine themselves if their doctor or nurse considers it appropriate and once they have been trained to do so. The medicine is for long-term use and the need to continue taking the medicine should be assessed by the doctor at least yearly.

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

Patients with atopic dermatitis, some types of asthma and chronic rhinosinusitis with nasal polyposis produce high levels of proteins called interleukin 4 and interleukin 13 (IL-4 and IL-13), which can cause inflammation of the skin and airways leading to the symptoms of these diseases. The active substance in Dupixent, dupilumab, is a monoclonal antibody (a type of protein) designed to block receptors (targets) for IL-4 and IL-13. By blocking the receptors, dupilumab prevents IL-4 and IL-13 from working and relieves disease symptoms.

Atopic dermatitis

Dupixent was more effective than placebo (a dummy treatment) at reducing the extent and severity of atopic dermatitis in 3 main studies in adults with moderate to severe disease. In the first study, which involved 740 patients, participants were given Dupixent or placebo, both in combination with a topical corticosteroid (a medicine for inflammation applied to the skin). Dupixent or placebo was used on its own in the other two studies involving a total of 1,379 patients.

After 16 weeks of treatment, 39% of patients treated with Dupixent every two weeks in the first study showed clearing or almost clearing of their atopic dermatitis compared with 12% of patients on placebo. Taking the results of the other two studies together, 37% of patients treated with Dupixent every two weeks had clearing or almost clearing of their atopic dermatitis compared with 9% of patients on placebo.

A study was also carried out in 251 adolescents aged from 12 to less than 18 years with moderate to severe atopic dermatitis. In this study, after 16 weeks atopic dermatitis had cleared up or almost cleared up in around 24% of those given Dupixent every 2 weeks compared with around 2% of those given placebo.

A further study looked at 367 children between 6 and 12 years of age with severe atopic dermatitis in whom medicines applied to the skin had proved insufficient or were unsuitable. After 16 weeks, measures of severity showed that atopic dermatitis had cleared up or almost cleared up in around 33% of those given Dupixent with a topical corticosteroid compared with around 11% of those given placebo with a corticosteroid.

Asthma

Dupixent was shown to reduce the number of exacerbations (flare-ups) of asthma during treatment in 2 main studies involving patients with asthma that was not adequately controlled by a combination of high-dose inhaled corticosteroids and other medicines. In the first study, involving 1,902 patients aged 12 years or above, the number of severe flare-ups per year was 0.46 in patients taking 200 mg Dupixent and 0.52 in patients taking 300 mg Dupixent, compared with 0.87 or 0.97 in patients given placebo. After 12 weeks of treatment, Dupixent improved patients’ FEV1 (the maximum volume of air a person can breathe out in one second) by 320 ml (for 200 mg Dupixent) or 340 ml (for 300 mg Dupixent) compared with 180 ml and 210 ml for placebo.

The second study, involving 210 patients taking corticosteroids by mouth for their asthma, showed that in 70% of patients given Dupixent their condition improved to the extent that they could reduce their corticosteroid dose compared with 42% of those given placebo.

A subsequent third study involved 408 children 6 to 11 years of age with severe asthma that was not adequately controlled by a combination of medium-to-high-dose inhaled corticosteroids and other medicines. It showed that the number of severe flare-ups of asthma per year was 0.31 in those with type 2 inflammation given Dupixent compared with 0.75 in similar children given a dummy treatment. After 12 weeks of treatment Dupixent improved patients’ predicted FEV1 by 10.5% compared with 5.3% in those given placebo.

Chronic rhinosinusitis with nasal polyposis

Adding Dupixent to treatment with a corticosteroid nasal spray has been shown to improve symptoms of the condition more than placebo in 2 main studies as measured by scoring systems for the extent of nasal polyps and patients’ perception of nasal congestion. In the first study, involving 276 adults, after around 6 months nasal polyp score fell by 1.89 with Dupixent and increased by 0.17 with placebo. Similarly, patients’ score for nasal congestion fell by 1.34 with Dupixent versus 0.45 with placebo. In the second study, involving 448 adults, the polyp score fell by 1.71 with Dupixent and increased by 0.10 with placebo, and the congestion score fell by 1.25 versus 0.38, respectively.

The most common side effects with Dupixent are injection-site reactions (such as redness, swelling including due to fluid build-up, itching and pain), conjunctivitis (redness and discomfort in the eye) including conjunctivitis due to allergy, joint pain, cold sores, and increased blood levels of a type of white blood cell called eosinophils, all of which may affect up to 1 in 10 people. There have been very rare cases of serum sickness (allergy to the proteins in the medicine) and serum sickness-like reactions, anaphylaxis (sudden, severe allergic reactions) and ulcerative keratitis (inflammation and damage to the clear layer at the front of the eye).

For the full list of side effects and restrictions of Dupixent, see the package leaflet.

Dupixent has been shown to reduce the extent and severity of atopic dermatitis in patients with moderate to severe disease, for whom available therapies are limited. Similarly, in chronic rhinosinusitis with nasal polyposis, Dupixent produced clinically meaningful improvements in symptoms. In the treatment of type-2 inflammatory asthma, Dupixent has been shown to reduce the number of asthma flare-ups and the need for oral corticosteroid treatment. Regarding safety, Dupixent’s side effects are generally mild and manageable.

The European Medicines Agency therefore decided that Dupixent’s benefits are greater than its risks and it can be authorised in the EU.

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

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

Dupixent received a marketing authorisation valid throughout the EU on 27 September 2017.