Patient Leaflet Updated 21-Aug-2025 | Amgen Ltd
WEZENLA 45 mg & 90mg solution for injection in pre-filled syringe
WEZENLA 45 mg solution for injection in pre-filled syringe
WEZENLA 90 mg solution for injection in pre-filled syringe
ustekinumab
▼This medicine is subject to additional monitoring. This will allow quick identification of new safety information. You can help by reporting any side effects you may get. See the end of section 4 for how to report side effects.
This leaflet has been written for the person taking the medicine. If you are the parent or caregiver who will give WEZENLA to a child, please read this information carefully.
1. What WEZENLA is and what it is used for
2. What you need to know before you use WEZENLA
3. How to use WEZENLA
4. Possible side effects
5. How to store WEZENLA
6. Contents of the pack and other information
WEZENLA contains the active substance ‘ustekinumab’, a monoclonal antibody. Monoclonal antibodies are proteins that recognise and bind specifically to certain proteins in the body.
WEZENLA belongs to a group of medicines called ‘immunosuppressants’. These medicines work by weakening part of the immune system.
WEZENLA is used to treat the following inflammatory diseases:
Plaque psoriasis is a skin condition that causes inflammation affecting the skin and nails. WEZENLA will reduce the inflammation and other signs of the disease.
WEZENLA is used in adults with moderate to severe plaque psoriasis, who cannot use ciclosporin, methotrexate or phototherapy, or where these treatments did not work.
WEZENLA is used in children and adolescents aged 6 years and older with moderate to severe plaque psoriasis who are unable to tolerate phototherapy or other systemic therapies or where these treatments did not work.
Psoriatic arthritis is an inflammatory disease of the joints, usually accompanied by psoriasis. If you have active psoriatic arthritis you will first be given other medicines. If you do not respond well enough to these medicines, you may be given WEZENLA to:
Crohn’s disease is an inflammatory disease of the bowel. If you have Crohn’s disease you will first be given other medicines. If you do not respond well enough or are intolerant to these medicines, you may be given WEZENLA to reduce the signs and symptoms of your disease.
Ulcerative colitis is an inflammatory disease of the bowel. If you have ulcerative colitis you will first be given other medicines. If you do not respond well enough or are intolerant to these medicines, you may be given WEZENLA to reduce the signs and symptoms of your disease.
If you are not sure if any of the above applies to you, talk to your doctor or pharmacist before using WEZENLA.
Talk to your doctor or pharmacist before using WEZENLA. Your doctor will check how well you are before each treatment. Make sure you tell your doctor about any illness you have before each treatment. Also tell your doctor if you have recently been near anyone who might have tuberculosis. Your doctor will examine you and do a test for tuberculosis, before you have WEZENLA. If your doctor thinks you are at risk of tuberculosis, you may be given medicines to treat it.
WEZENLA can cause serious side effects, including allergic reactions and infections. You must look out for certain signs of illness while you are taking WEZENLA. See ‘Serious side effects’ in section 4 for a full list of these side effects.
If you are not sure if any of the above applies to you, talk to your doctor or pharmacist before using WEZENLA.
Some patients have experienced lupus-like reactions including skin lupus or lupus-like syndrome during treatment with ustekinumab. Talk to your doctor right away if you experience a red, raised, scaly rash sometimes with a darker border, in areas of the skin that are exposed to the sun or with joint pains.
Heart attack and strokes have been observed in a study in patients with psoriasis treated with ustekinumab. Your doctor will regularly check your risk factors for heart disease and stroke in order to ensure that they are appropriately treated. Seek medical attention right away if you develop chest pain, weakness or abnormal sensation on one side of your body, facial droop, or speech or visual abnormalities.
WEZENLA is not recommended for use in children with psoriasis under 6 years of age, or for use in children under 18 years of age with psoriatic arthritis, Crohn’s disease, or ulcerative colitis because it has not been studied in this age group.
Tell your doctor or pharmacist:
WEZENLA has no or negligible influence on the ability to drive and use machines.
WEZENLA contains 0.02 mg (45 mg/0.5 mL) or 0.04 mg (90 mg/1.0 mL) of polysorbate 80 (E 433) in each dosage unit which is equivalent to 0.04 mg/mL. Polysorbates may cause allergic reactions. Tell your doctor if you have any known allergies.
WEZENLA is intended for use under the guidance and supervision of a doctor experienced in treating conditions for which WEZENLA is intended.
Always use this medicine exactly as your doctor has told you. Check with your doctor if you are not sure. Talk to your doctor about when you will have your injections and follow-up appointments.
Your doctor will decide how much WEZENLA you need to use and for how long.
Adults aged 18 years or older
Psoriasis or Psoriatic Arthritis
Crohn’s disease or ulcerative colitis
Children and adolescents aged 6 years or older
Psoriasis
Talk to your doctor if you have any questions about giving yourself an injection.
If you have used or been given too much WEZENLA, talk to a doctor or pharmacist straight away. Always have the outer carton of the medicine with you, even if it is empty.
If you forget a dose, contact your doctor or pharmacist. Do not take a double dose to make up for a forgotten dose.
It is not dangerous to stop using WEZENLA. However, if you stop, your symptoms may come back.
If you have any further questions on the use of this medicine, ask your doctor or pharmacist.
Like all medicines, this medicine can cause side effects, although not everybody gets them.
Some patients may have serious side effects that may need urgent treatment.
Allergic reactions – these may need urgent treatment. Tell your doctor or get emergency medical help straight away if you notice any of the following signs.
In rare cases, allergic lung reactions and lung inflammation have been reported in patients who receive ustekinumab. Tell your doctor right away if you develop symptoms such as cough, shortness of breath, and fever.
If you have a serious allergic reaction, your doctor may decide that you should not use WEZENLA again.
Infections – these may need urgent treatment. Tell your doctor straight away if you notice any of the following signs.
WEZENLA may make you less able to fight infections. Some infections could become serious and may include infections caused by viruses, fungi, bacteria (including tuberculosis), or parasites, including infections that mainly occur in people with a weakened immune system (opportunistic infections). Opportunistic infections of the brain (encephalitis, meningitis), lungs, and eye have been reported in patients receiving treatment with ustekinumab.
You must look out for signs of infection while you are using WEZENLA. These include:
Tell your doctor straight away if you notice any of these signs of infection. These may be signs of infections such as chest infections, skin infections, shingles or opportunistic infections that could have serious complications. Tell your doctor if you have any kind of infection that will not go away or keeps coming back. Your doctor may decide that you should not use WEZENLA until the infection goes away. Also tell your doctor if you have any open cuts or sores as they might get infected.
Shedding of skin – increase in redness and shedding of skin over a larger area of the body may be symptoms of erythrodermic psoriasis or exfoliative dermatitis, which are serious skin conditions. You should tell your doctor straight away if you notice any of these signs.
Common side effects (may affect up to 1 in 10 people):
Uncommon side effects (may affect up to 1 in 100 people):
Rare side effects (may affect up to 1 in 1,000 people):
Very rare side effects (may affect up to 1 in 10,000 people):
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 (see details below). By reporting side effects you can help provide more information on the safety of this medicine.
or search for MHRA Yellow Card in the Google Play or Apple App Store.
WEZENLA is for single use only. Any unused product remaining in the syringe should be thrown away. Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.
WEZENLA is a clear to opalescent, colourless to light yellow solution for injection. It is supplied as a carton pack containing 1 single-dose, glass 1 mL pre-filled syringe. Each pre-filled syringe contains 45 mg ustekinumab in 0.5 mL or 90 mg ustekinumab in 1 mL of solution for injection.
For any information about this medicine, please contact the Marketing Authorisation Holder:
This leaflet was last revised in June 2025.
This Instructions for Use contains information on how to inject WEZENLA with a pre-filled syringe. This pre-filled syringe delivers WEZENLA with an under-the-skin (subcutaneous) injection. See Package Leaflet for medicine information.
Dosing:
Using your WEZENLA pre-filled syringe:
Important: Keep the pre-filled syringe and sharps disposal container out of the sight and reach of children.
2a Grasp the pre-filled syringe by the body and remove from carton.
2b Wait 30 minutes for the pre-filled syringe to reach room temperature.
WAIT
30
minutes
2c Gather and place the items for your injection on a clean, well-lit surface.
3a Inspect the medicine. It should be clear to opalescent, colourless to light yellow solution.
3b Check the expiry date (EXP) and inspect the pre-filled syringe.
3c Inject in one of these locations.
Important: Avoid areas with scars, stretch marks or where skin is tender, bruised, red, or hard. If possible, do not use areas of skin that show signs of psoriasis.
3d Wash hands thoroughly with soap and water.
3e Clean injection site with alcohol wipe.
4a Pull the needle cap straight off while holding the syringe body.
Important: Only remove the cap when you can inject right away (within 5 minutes) because the medicine can dry out.
4b Pinch the skin around the injection site before injection.
Important: Continue to pinch the skin until the injection is complete.
4c Insert the needle into the pinched skin.
4d Slowly press the plunger head down until it is completely between the needle guard clips.
4e Keep pressure on the plunger head and remove needle from skin.
If a second injection is required…
4f Repeat steps 2a-4e if a second injection is required.
Important: Never put the cap back on.
5a Place the used pre-filled syringe and needle cap in the sharps disposal container.
Do not throw away the pre-filled syringe into the household waste.
5b Check injection site.
Any unused product remaining in the syringe should be thrown away. Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.
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