Patient Leaflet Updated 12-Jun-2026 | Ipsen Ltd
Bylvay 200 mcg 400 mcg 600 mcg 1200 mcg hard capsule
Bylvay 200 micrograms hard capsules
Bylvay 400 micrograms hard capsules
Bylvay 600 micrograms hard capsules
Bylvay 1 200 micrograms hard capsules
odevixibat
▼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.
1. What Bylvay is and what it is used for
2. What you need to know before you take Bylvay
3. How to take Bylvay
4. Possible side effects
5. How to store Bylvay
6. Contents of the pack and other information
Bylvay contains the active substance odevixibat. Odevixibat is a medicine which increases the removal of substances called bile acids from the body. Bile acids are components of the digestive fluid called bile, which is produced by the liver and secreted into the intestines. Odevixibat blocks the mechanism that normally reabsorbs them from the intestines after they have done their job. This allows them to pass out of the body in the stool.
Bylvay is used to treat progressive familial intrahepatic cholestasis (PFIC) in patients aged 6 months or older. PFIC is a liver disease caused by build-up of bile acids (cholestasis) that gets worse over time and is often accompanied with severe itching.
Bylvay is also used to treat itching caused by bile build-up in patient aged 6 months or older who have Alagille syndrome (ALGS).
Talk to your doctor or pharmacist before taking Bylvay if you have:
Talk to your doctor if you develop diarrhoea while taking Bylvay. Drinking sufficient liquid is recommended in patients with diarrhoea to prevent dehydration.
Increased levels in liver function tests can occur in some patients receiving Bylvay. Assessment of liver function is recommended for all patients prior to Bylvay treatment. Your doctor may recommend more frequent monitoring if you have elevated liver function test results.
Your doctor may recommend assessment of Vitamin A, D and E blood levels and the blood clotting value called INR prior to and during Bylvay treatment.
Bylvay is not recommended for babies under 6 months because it is not known if the medicine is safe and effective in this age group.
Tell your doctor or pharmacist if you are using, have recently used or might use any other medicines. Treatment with odevixibat may affect the absorption of fat-soluble vitamins such as Vitamin A, D and E, and some medicines, including oral contraceptives.
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor for advice before taking this medicine.
Bylvay is not recommended during pregnancy and in women of childbearing potential not using contraception. Use of a barrier contraceptive method is recommended since the uptake of lipophilic oral contraceptives may be affected by odevixibat.
It is not known if odevixibat can pass into breast milk and affect the baby. Your doctor will help you to decide whether to stop breast-feeding or avoid Bylvay treatment, considering the benefit of breast-feeding to the baby and Bylvay to the mother.
Bylvay has no or negligible influence on the ability to drive or capacity to use machinery.
Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure.
Treatment must be started and supervised by a doctor experienced in the management of progressive liver disease with reduced bile flow.
The dose of Bylvay is based on your weight. Your doctor will work out the right number and strength of capsules for you to take.
PFIC
ALGS
No dose differences are recommended for adults.
Take the capsules once daily in the morning with or without food.
All capsules can be either swallowed whole with a glass of water or opened and sprinkled on food or in an age-appropriate liquid (e.g. breast milk, infant formula or water).
The larger 200 and 600 micrograms capsules are intended to be opened and sprinkled on food or in an age-appropriate liquid but may be swallowed whole.
The smaller 400 micrograms and 1 200 micrograms capsules are intended to be swallowed whole but may be opened and sprinkled on food or in an age-appropriate liquid.
Detailed instructions on how to open capsules and sprinkle on food or in a liquid can be found at the end of this package leaflet.
If the medicine does not improve your condition after 6 months of continuous daily treatment, your doctor will recommend an alternative treatment.
Tell your doctor if you think you have taken too much Bylvay.
Possible overdose symptoms are diarrhoea, stomach and bowel problems.
PFIC
Do not take a double dose to make up for a forgotten dose. Take the next dose at the usual time.
ALGS
Take the forgotten dose as soon as possible, but do not take more than one dose per day.
Do not stop taking Bylvay without first discussing with your doctor.
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.
Side effects may occur with the following frequency:
PFIC
common (may affect up to 1 in 10 people)
ALGS
Very common (may affect more than 1 in 10 people)
Common (may affect up to 1 in 10 people)
If you get any side effects, talk to your doctor or pharmacist. 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 Yellow Card in the Google Play or Apple App Store.
By reporting side effects, you can help provide more information on the safety of this medicine.
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 carton and bottle after EXP. The expiry date refers to the last day of that month.
Store in the original package to protect from light. Do not store above 25 °C.
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.
Bylvay 200 micrograms hard capsules:
Size 0 capsules (21.7 mm × 7.64 mm) with ivory opaque cap and white opaque body; imprinted “A200” with black ink.
Bylvay 400 micrograms hard capsules:
Size 3 capsules (15.9 mm × 5.82 mm) with orange opaque cap and white opaque body; imprinted “A400” with black ink.
Bylvay 600 micrograms hard capsules:
Size 0 capsules (21.7 mm × 7.64 mm) with ivory opaque cap and body; imprinted “A600” with black ink.
Bylvay 1 200 micrograms hard capsules:
Size 3 capsules (15.9 mm × 5.82 mm) with orange opaque cap and body; imprinted “A1200” with black ink.
Bylvay hard capsules are packed in a plastic bottle with a tamper evident, child resistant polypropylene closure. Pack size: 30 hard capsules.
Not all strengths and pack size are marketed.
For any information about this medicine, please contact the local representative of the Marketing Authorisation Holder.
This leaflet was last revised in March 2026
Other sources of information
Is this leaflet hard to see or read? Please phone +44 (0) 1753 627777 and ask for help.
Instructions to open capsules and sprinkle the contents on food:
Step 1. Place a small amount of soft food into a bowl (2 tablespoons/30 mL of yoghurt, apple sauce, banana or carrot puree, chocolate pudding, rice pudding or oatmeal porridge). Food should be at or below room temperature.
Step 2:
Step 3:
Step 4:
Instructions to open capsules and sprinkle the contents in an age appropriate liquid:
Do not administer via a bottle or “sippy cup” because the pellets will not pass through the opening. Pellets will not dissolve in liquids.
Contact your pharmacy if you do not have a suitable oral syringe for administration at home.
Step 1:
Step 2:
Step 3:
Step 4:
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