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This website is intended for use by patients prescribed HYMPAVZI®▼ (marstacimab) in the UK, and has been developed and funded by Pfizer Ltd.

▼ 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 https://yellowcard.mhra.gov.uk/ or search MHRA Yellow Card in the Google Play or Apple App store for how to report side effects.

This information is not intended to be a substitute for advice provided by a healthcare professional. For advice, please consult a healthcare professional.

Adverse event reporting information can be found at the bottom of this page.

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Welcome to the HYMPAVZI Patient Hub

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This site offers information about haemophilia and how HYMPAVZI works. It also answers common questions and provides a variety of different resources.
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Explore the HYMPAVZI Patient Hub

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Explore more about Haemophilia and how HYMPAVZI works

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Explore More
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Learn more about how to take HYMPAVZI

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View and download available patient resources

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View and Download
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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 the package leaflet. You can also report side effects directly via the Yellow Card Scheme at https://yellowcard.mhra.gov.uk or search for MHRA Yellow Card in the Google Play or Apple App Store. Any suspected side effects may also be reported to Pfizer medical information on 01304 616161. By reporting side effects, you can help provide more information to the safety of this medicine.