Patient leaflet - Dupixent 300 mg solution for injection in Pre-filled pen
1. What Dupixent is and what it is used for
What Dupixent is
Dupixent contains the active substance dupilumab.
Dupilumab is a monoclonal antibody (a type of specialised protein) that blocks the action of proteins called interleukins (IL)-4 and IL-13. Both play a major role in causing the signs and symptoms of atopic dermatitis, asthma, chronic rhinosinusitis with nasal polyposis (CRSwNP), prurigo nodularis (PN), eosinophilic esophagitis (EoE), chronic obstructive pulmonary disease (COPD) and chronic spontaneous urtircaria (CSU).
What Dupixent is used for
Dupixent is used to treat adults and adolescents 12 years and older with moderate-to-severe atopic dermatitis, also known as atopic eczema. Dupixent is also used to treat children 6 months to 11 years old with severe atopic dermatitis (see section Children and adolescents). Dupixent may be used with eczema medicines that you apply to the skin or it may be used on its own.
Dupixent is also used with other asthma medicines for the maintenance treatment of severe asthma in adults, adolescents, and children aged 6 years and older whose asthma is not controlled with their current asthma medicines (e.g. corticosteroids).
Dupixent is also used with other medicines for the maintenance treatment of CRSwNP in adults whose disease is not controlled with their current CRSwNP medicines. Dupixent can also reduce the need for surgery and the need for systemic corticosteroid use.
it may be used on its own.
Dupixent is also used to treat adults with moderate-to-severe prurigo nodularis (PN), also known as chronic nodular prurigo (CNPG). Dupixent may be used with PN medicines that you apply to the skin or
Dupixent is also used to treat adults, adolescents and children 1 year and older, weighing at least 15 kg, with eosinophilic esophagitis (EoE).
Dupixent is also used with other medicines for the maintenance treatment of chronic obstructive pulmonary disease (COPD) in adults with uncontrolled COPD.
Dupixent is also used to treat chronic spontaneous urticaria (CSU) in adults and adolescents aged 12 years and older.
How Dupixent works
Using Dupixent for atopic dermatitis (atopic eczema) can improve the condition of your skin and reduce itching. Dupixent has also been shown to improve symptoms of pain, anxiety, and depression associated with atopic dermatitis. In addition, Dupixent helps improve your sleep disturbance and overall quality of life.
Dupixent helps prevent severe asthma attacks (exacerbations) and can improve your breathing. Dupixent may also help reduce the amount of another group of medicines you need to control your asthma, called oral corticosteroids, while preventing severe asthma attacks and improving your breathing.
Dupixent helps prevent moderate or severe COPD attacks (exacerbations) and can improve your breathing. Dupixent may also help to improve overall symptoms of COPD.
2. What you need to know before you use Dupixent
Do not use Dupixent
- if you are allergic to dupilumab or any of the other ingredients of this medicine (listed in section 6).
If you think you may be allergic, or you are not sure, ask your doctor, pharmacist or nurse for advice before using Dupixent.
Warnings and precautions
Talk to your doctor, pharmacist or nurse before using Dupixent:
Dupixent is not a rescue medicine and should not be used to treat a sudden asthma or COPD attack.
Every time you get a new pack of Dupixent, it is important that you note down the name of the medicine, the date of the administration and the batch number (which is on the packaging after “Lot”) and keep this information in a safe place.
Allergic reactions
- Rarely, Dupixent can cause serious side effects, including allergic (hypersensitivity) reactions and anaphylactic reaction and angioedema. These reactions can occur from minutes until seven days after Dupixent administration. You must look out for signs of these conditions (i.e. breathing problems, swelling of the face, lips, mouth, throat or tongue, fainting, dizziness, feeling lightheaded (low blood pressure), fever, general ill feeling, swollen lymph nodes, hives, itching, joint pain, skin rash) while you are taking Dupixent. Such signs are listed under “Serious side effects” in section 4.
Stop using Dupixent and tell your doctor or get medical help immediately if you notice any signs of an allergic reaction.
Eosinophilic conditions
- Rarely patients taking an asthma medicine may develop inflammation of blood vessels or lungs due to an increase of certain white blood cells (eosinophilia).
- It is not known whether this is caused by Dupixent. This usually, but not always, happens in people who also take a steroid medicine which is being stopped or for which the dose is being lowered.
- Tell your doctor immediately if you develop a combination of symptoms such as a flu-like illness, pins and needles or numbness of arms or legs, worsening of pulmonary symptoms, and/or rash.
Parasitic (intestinal parasites) infection
- Dupixent may weaken your resistance to infections caused by parasites. If you already have a parasitic infection it should be treated before you start treatment with Dupixent.
- Check with your doctor if you have diarrhoea, gas, upset stomach, greasy stools, and dehydration which could be a sign of a parasitic infection.
- If you live in a region where these infections are common or if you are travelling to such a region check with your doctor.
Asthma
If you have asthma and are taking asthma medicines, do not change or stop your asthma medicine without talking to your doctor. Talk to your doctor before you stop Dupixent or if your asthma remains uncontrolled or worsens during treatment with this medicine.
Eye problems
Talk to your doctor promptly if you have any new or worsening eye problems.
These may include watering, itching, redness and swelling, eye dryness, a feeling of gritty eyes or a sensation of a foreign body in the eye. If you experience sudden changes in vision or significant eye pain that does not settle, speak to your doctor straight away.
Children and adolescents
- The Dupixent pre-filled pen is not intended for use in children below 2 years of age.
- For children aged 6 months to less than 2 years of age, contact your doctor who will prescribe the appropriate Dupixent pre-filled syringe.
- In children 6 months to less than 12 years of age, dupilumab should be given by a caregiver.
- In children 12 years of age and older, it is recommended that dupilumab is administered by or under supervision of an adult.
- The safety and benefits of Dupixent are not yet known in children with atopic dermatitis below the age of 6 months.
- The safety and benefits of Dupixent are not yet known in children with asthma below the age of 6 years.
- The safety and benefits of Dupixent are not yet known in children with CRSwNP below the age of 18 years.
- The safety and benefits of Dupixent are not known in children with PN below the age of 18 years.
The safety and benefits of Dupixent are not yet known in children with EoE below the age of 1 year, or with a body weight < 15 kg.
- The safety and benefits of Dupixent are not known in children with COPD below the age of 18 years.
- The safety and benefits of Dupixent are not yet known in children with CSU below the age of 12 years.
Other medicines and Dupixent
Tell your doctor or pharmacist
- if you are using, have recently used or might use any other medicines.
- if you have recently had or are due to have a vaccination.
Other medicines for asthma
Do not stop or reduce your asthma medicines, unless instructed by your doctor.
- These medicines (especially ones called corticosteroids) must be stopped gradually.
- This must be done under the direct supervision of your doctor and dependent on your response to Dupixent.
Pregnancy and breast-feeding
- If you are pregnant, think you may be pregnant, or are planning to have a baby, ask your doctor for advice before using this medicine. The effects of this medicine in pregnant women are not known; therefore, it is preferable to avoid the use of Dupixent in pregnancy unless your doctor advises to use it.
- If you are breast-feeding or are planning to breast-feed, talk to your doctor before using this medicine. You and your doctor should decide if you will breast-feed or use Dupixent. You should not do both.
Driving and using machines
Dupixent is unlikely to influence your ability to drive and use machines.
Dupixent contains sodium
This medicine contains less than 1 mmol sodium (23 mg) per 300 mg dose, that is to say essentially ‘sodium-free’.
Dupixent contains polysorbate
This medicine contains 4 mg of polysorbate 80 in each 300 mg dose (2 mL). Polysorbates may cause allergic reactions. Tell your doctor if you have or your child has any known allergies.
3. How to use Dupixent
Always use this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.
How much Dupixent you will receive
Your doctor will decide which dose of Dupixent is right for you.
Recommended dose in adults with atopic dermatitis
For patients with atopic dermatitis, the recommended dose of Dupixent is:
- An initial dose of 600 mg (two 300 mg injections)
- Followed by 300 mg given every other week by subcutaneous injection.
Recommended dose in adolescents with atopic dermatitis
The recommended dose of Dupixent for adolescents (12 to 17 years of age) with atopic dermatitis is based on body weight:
| Body weight of patient | Initial dose | Subsequent doses (every other week) |
| less than 60 kg | 400 mg (two 200 mg injections) | 200 mg |
| 60 kg or more | 600 mg (two 300 mg injections) | 300 mg |
Recommended dose in children 6 to 11 years of age with atopic dermatitis
The recommended dose of Dupixent for children (6 to 11 years of age) with atopic dermatitis is based on body weight:
| Body weight of patient | Initial dose | Subsequent doses |
| 15 kg to less than 60 kg | 300 mg (one 300 mg injection) on Day 1, followed by 300 mg on Day 15 | 300 mg every 4 weeks*, starting 4 weeks after Day 15 dose |
| 60 kg or more | 600 mg (two 300 mg injections) | 300 mg every other week |
* The dose may be increased to 200 mg every other week based on the doctor’s opinion.
Recommended dose in children 6 months to 5 years of age with atopic dermatitis
The recommended dose of Dupixent for children 6 months to 5 years of age with atopic dermatitis is based on body weight:
| Body Weight of Patient | Initial Dose | Subsequent Doses |
| 5 kg to less than 15 kg | 200 mg (one 200 mg injection) | 200 mg every 4 weeks |
| 15 kg to less than 30 kg | 300 mg (one 300 mg injection) | 300 mg every 4 weeks |
Recommended dose in adult and adolescent patients with asthma (12 years of age and older)
For patients with severe asthma and who are on oral corticosteroids or for patients with severe asthma and co-morbid moderate-to-severe atopic dermatitis or adults with co-morbid severe chronic rhinosinusitis with nasal polyposis, the recommended dose of Dupixent is:
- An initial dose of 600 mg (two 300 mg injections)
- Followed by 300 mg given every other week administered as subcutaneous injection.
For all other patients with severe asthma, the recommended dose of Dupixent is:
- An initial dose of 400 mg (two 200 mg injections)
Followed by 200 mg given every other week administered as subcutaneous injection.
Recommended dose children with asthma
The recommended dose of Dupixent for children (6 to 11 years of age) with asthma is based on body weight:
| Body weight of patient | Initial and subsequent doses |
| 15 to less than 30 kg | 300 mg every 4 weeks |
| 30 kg to less than 60 kg | 200 mg every other week or 300 mg every 4 weeks |
| 60 kg or more | 200 mg every other week |
For patients 6 to 11 years old with asthma and coexisting severe atopic dermatitis, your doctor will decide which dose of Dupixent is right for you.
Recommended dose in adults with chronic rhinosinusitis with nasal polyposis (CRSwNP)
In CRSwNP, the recommended first dose of Dupixent is 300 mg followed by 300 mg given every two weeks by subcutaneous injection.
Recommended dose in adults with prurigo nodularis (PN)
For patients with prurigo nodularis, the recommended dose of Dupixent is:
- An initial dose of 600 mg (two 300 mg injections)
- Followed by 300 mg given every other week by subcutaneous injection.
Recommended dose in adults, adolescents and children (1 year of age and older) with eosinophilic esophagitis (EoE)
| Body Weight | Dose |
| ≥15 to <30 kg | 200 mg every other week |
| ≥30 to <40 kg | 300 mg every other week |
| ≥40 kg | 300 mg every week |
Recommended dose in adults with chronic obstructive pulmonary disease (COPD) In COPD, the recommended dose of Dupixent is 300 mg given every other week by subcutaneous injection.
Recommended dose in adults with chronic spontaneous urticaria (CSU)
The recommended dose of Dupixent for adult patients is an initial dose of 600 mg (two 300 mg injections), followed by 300 mg given every other week.
Recommended dose in adolescents with chronic spontaneous urticaria (CSU)
The recommended dose of Dupixent for adolescents (12 to 17 years of age) with chronic spontaneous urticaria is based on body weight:
| Body Weight | Initial Dose | Subsequent Doses |
| 30 to less than 60 kg | 400 mg (two 200 mg injections) | 200 mg every other week (Q2W) |
| 60 kg or more | 600 mg (two 300 mg injections) | 300 mg every other week (Q2W) |
Injecting Dupixent
Dupixent is given by injection under your skin (subcutaneous injection). You and your doctor or nurse should decide if you should inject Dupixent yourself.
Before injecting Dupixent yourself you must have been properly trained by your doctor or nurse. Your Dupixent injection may also be given by a caregiver after proper training by a doctor or nurse.
Each pre-filled pen contains one dose of Dupixent (300 mg). Do not shake the pre-filled pen.
Read carefully the “Instructions for Use” included at the end of the package leaflet before using Dupixent.
If you use more Dupixent than you should
If you use more Dupixent than you should or the dose has been given too early, talk to your doctor, pharmacist or nurse.
If you forget to use Dupixent
If you have forgotten to inject a dose of Dupixent, talk to your doctor, pharmacist or nurse. In addition,
If your dose schedule is every week and you miss a dose of Dupixent:
- give the Dupixent injection as soon as possible and start a new every week dose schedule from the time you remember to take your Dupixent injection.
If your dose schedule is every other week and you miss a dose of Dupixent:
- give the Dupixent injection within 7 days from the missed dose, then continue with your original schedule.
- if the missed dose is not given within 7 days, wait until the next scheduled dose to give your Dupixent injection.
If your dose schedule is every 4 weeks and you miss a dose of Dupixent:
- give the Dupixent injection within 7 days from the missed dose, then continue with your original schedule.
- if the missed dose is not given within 7 days, start a new every 4 week dose schedule from the time you remember to take your Dupixent injection.
If you stop using Dupixent
Do not stop using Dupixent without speaking to your doctor first.
If you have any further questions on the use of this medicine, ask your doctor, pharmacist or nurse.
4. Possible side effects
Like all medicines, this medicine can cause side effects, although not everybody gets them.
Dupixent can cause serious side effects, including rare allergic (hypersensitivity) reactions, including anaphylactic reaction, serum sickness reaction, serum sickness-like reaction; the signs may include:
- breathing problems
- swelling of the face, lips, mouth, throat or tongue (angioedema)
- fainting, dizziness, feeling lightheaded (low blood pressure)
- fever
- general ill feeling
- swollen lymph nodes
- hives
- itching
- joint pain
- skin rash
If you develop an allergic reaction, stop using Dupixent and talk to your doctor right away.
Other side effects
Common (may affect up to 1 in 10 people):
- injection site reactions (e.g. localized redness, swelling, itching, pain, bruising)
- eye redness and itching
- eye infection
- cold sores (on lips and skin)
- an increase in a certain kind of white blood cell (eosinophils)
- joint pain (arthralgia)
Uncommon (may affect up to 1 in 100 people):
- swelling of the face, lips, mouth, throat or tongue (angioedema)
- eyelid itching, redness and swelling*
- inflammation of the eye surface, sometimes with blurred vision (keratitis)
- facial rash or redness
- eye dryness*
*These eye side effects were common (up to 1 in 10 people) in patients with atopic dermatitis
Rare (may affect up to 1 in 1000 people):
- serious allergic (hypersensitivity) reactions
- ulcers on the outer clear layer of the eye, sometimes with blurred vision (ulcerative keratitis)*
*The side effect of ulcerative keratitis was uncommon (up to 1 in 100 people) in patients with atopic dermatitis
Additional side effects in children 6 to 11 years old with asthma Common: pinworms (enterobiasis)
Reporting of side effects
If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine.
5. How to store Dupixent
Keep this medicine out of the sight and reach of children.
Do not use this medicine after the expiry date which is stated on the label and carton after EXP. The expiry date refers to the last day of that month.
Store in a refrigerator (2 °C to 8 °C). Do not freeze. Store in the original carton to protect from light. If necessary, the pre-filled pen can be removed from the refrigerator and kept in the pack for up to 14 days at room temperature up to 25 °C, while protected from light. The date of removal from the refrigerator shall be recorded in the space provided on the outer carton. The pack must be discarded if left out of the refrigerator for more than 14 days or if the expiry date has passed.
Do not use this medicine if you notice that the medicine is cloudy, discoloured, or has particles in it. Do not throw away any medicines via wastewater or household waste. Ask your doctor, pharmacist or nurse how to throw away medicines you no longer use. These measures will help protect the environment.
If the medicine becomes discolored or shows any other signs of deterioration, you should seek the advice of your pharmacist who will tell you what to do.
6. Contents of the pack and other information
What Dupixent contains
- The active substance is dupilumab.
- Each pre-filled pen contains 300 mg of dupilumab in 2 mL solution for injection (injection).
- The other ingredients are L-Arginine monohydrochloride, L-Histidine, L-Histidine monohydrochloride monohydrate, Polysorbate 80 (E 433), Sodium acetate trihydrate, Acetic acid glacial (E 260), Sucrose, Water for injections.
What Dupixent looks like and contents of the pack
Dupixent is a clear to slightly opalescent, colourless to pale yellow solution supplied in a pre-filled pen.
The pre-filled pen has a square cap with ridges and an oval viewing window without an arrow.
Dupixent is available as 300 mg pre-filled pens in a pack containing 2 pre-filled pens.
Manufacturers
SANOFI WINTHROP INDUSTRIE
1051 Boulevard Industriel,
76580 LE TRAIT,
FRANCE
or
Sanofi-Aventis Deutschland GmbH
Brüningstrasse 50
Industriepark Hoechst
65926 FRANKFURT AM MAIN
GERMANY
or
Genzyme Ireland Limited
IDA Industrial Park
Old Kilmeaden Road
Waterford
Ireland
Procured from within the EU and repackaged for the PL Holder:
Abacus Medicine Ltd., Abbey House, 282 Farnborough Road, Farnborough,
GU14 7NA, United Kingdom
PL 45763/1005
| POM |
Dupixent® is a registered trademark of SANOFI BIOTECHNOLOGY
This leaflet does not contain all the information about your medicine. If you have any questions or are not sure about anything, ask your doctor or pharmacist.
For any information about this medicine, please contact the local representative of the Product Licence Holder:
Abacus Medicine Ltd.
tel: +44(0)2036301244 email: MedInfo@abacusmedicine.co.uk or drugsafetyuk@abacusmedicine.co.uk
This leaflet was last revised on 24/02/2026.
Blind or partially sighted?
Is this leaflet hard to see or read? Call 02036301310 or write to info@abacusmedicine. com to obtain the leaflet in a format suitable for you.
UK521005U99
‑A1.1
The parts of the Dupixent pre-filled
pen are shown in this picture.
Dupixent 300 mg
solution for injection
in a pre-filled pen
dupilumab
How to Store Dupixent
Important information
Before Injection
After Injection
This device is a single‑use pre‑filled pen. It contains 300 mg of Dupixent for injection under the skin (subcutaneous injection).
You must not try to give yourself or someone else the injection unless you have received training from your healthcare professional. In adolescents 12 years and older,
it is recommended that Dupixent is administered by or
under supervision of an adult. In children less than
12 years of age, Dupixent should be given by a caregiver. The Dupixent pre
children aged 2 years and older.
‑filled pen is only for use in adults and
Read all of the instructions carefully before using the pre
‑filled pen.
- Ask your healthcare professional how often you will need to inject the medicine.
- Choose a different injection site for each injection
Do not use the pre
‑filled pen if it has been damaged.
Do not use the pre
not securely attached.
‑filled pen if the green cap is missing or
- Do not press or touch the yellow needle cover with your fingers.
- Do not inject through clothes.
- Do not remove the green cap until just before you give the injection.
Do not try to put the green cap back on the pre
‑filled pen.
Do not re‑use the pre
‑filled pen.
Keep the pre
the reach of children.
‑filled pen(s) and all medicines out of
Keep unused pre
and store in the refrigerator between 2ºC and 8ºC.
‑filled pens in the original carton
Store pre
it from light.
‑filled pens in the original carton to protect
Do not keep pre
(<25ºC) for more than 14 days. If you need to permanently remove the carton from the refrigerator, write down the date of removal in the space provided on the outer carton, and use Dupixent within 14 days.
‑filled pens at room temperature
Do not shake the pre
‑filled pen at any time.
Do not heat the pre
‑filled pen.
Do not freeze the pre
‑filled pen.
Do not place the pre
‑filled pen into direct sunlight.
Window
Yellow Window
‑ Injection Complete
Instructions for use
Medicine
Green
Cap
Label
Green Cap
(Removed)
Yellow Needle Cover
(Needle inside)
Prepare
Choose your injection site
B
A
A5
B1
B2
A4
A1
A2
A3
Gather supplies
Ensure you have the following:
the Dupixent pre
‑filled pen
- 1 alcohol wipe*
- 1 cotton ball or gauze*
a puncture
(See Step D)
‑resistant container*
*Items not included in the carton
Look at the label
Confirm that you have the correct
product and dose.
Check expiration date
Check the expiration date.
Do not use the pre-filled pen if
the expiration date has passed.
Do not keep Dupixent at room 
temperature for more than
14 days.
Check the medicine
Wait 45 minutes
Self
‑injection or by caregiver
Injection by caregiver only
- Thigh
- Stomach except for the 5 cm around your belly button (navel).
- Upper Arm If a caregiver gives your dose, they can also use the outer area of the upper arm.
Choose a different injection site for each Dupixent injection.
Do not inject through clothes.
Do not inject into skin that is tender, damaged, bruised or scarred.
Wash your hands
Prepare the injection site
- Clean the injection site with an alcohol wipe.
Let your skin dry before injecting.
Do not touch the injection site again or blow on it before the injection.
Recommended injection sites are:
Lay the pre
on a flat surface and let it naturally warm up at room temperature (less than 25ºC) for at least 45 minutes.
‑filled pen
Look at the medicine through the window on the pre
‑filled pen.
Check if the liquid is clear and colourless to pale yellow.
Note: You may see an air bubble; this is normal.
Expiration Date
Look at the Label
Injection by
caregiver only
B3
Do not warm the pre-filled pen in a microwave, hot water, or direct sunlight.
Do not put the pre-filled pen into direct sunlight.
Do not keep Dupixent at room temperature for more than 14 days.
Check Window
Self
‑injection or
by caregiver
Do not use the pre-filled pen if the liquid is discolored or cloudy, or if it contains visible flakes or particles.
Do not use the pre-filled pen if the window is yellow.
Give injection
D
C
Dispose
C4
C3
C5
C2
C1
Remove
Press down
Remove green cap
Pinch skin and Place
Hold firmly
Pinching of the skin is not needed for adults and children aged 12 years and older
Pinching of the skin is not needed for adults and children aged 12 years and older
- Pinch the skin before and during the injection.
- Pinching is not needed for adults and children aged 12 years and older.
When placing the yellow needle cover on your skin, hold the pre
the window.
‑filled pen so that you can see
Place the yellow needle cover on your skin at approximately a 90
‑degree angle.
Do not press or touch the yellow needle cover
with your fingers. The needle is inside.
Press the pre
you cannot see the yellow needle cover, and hold.
‑filled pen firmly against your skin until
- There will be a “click” when the injection starts.
- The window will start to turn yellow.
The injection can take up to 15 seconds.
Dispose of the pre
and green caps in a puncture resistant container right away after use.
‑filled pens, (needle inside),
Do not dispose of (throw away) pre
(needle inside), and green caps in your household trash.
‑filled pens
Do not put the green cap back on.
Keep holding the pre
skin.
‑filled pen firmly against your
- You may hear a second click.
- Check that the entire window has turned to yellow.
- Then slowly count to 5.
- Then lift the pen up off the skin, your injection is complete.
If the window does not turn completely yellow, remove the pen and call your healthcare provider.
Do not give yourself a second dose without
speaking to your healthcare provider.
After you have completed your injection pull straight up to remove pre
skin and dispose of immediately as described in section D.
‑filled pen from the
If you see any blood at the site, lightly dab a cotton ball or gauze pad.
Do not rub your skin after the injection.
Pull the green cap straight off
Do not twist the green cap off.
Do not remove the green cap until you are ready to inject.
Do not press or touch the yellow needle cover with your fingers.
The needle is inside.
Do not put the green cap back on the pre-
filled pen after you have removed it.