Frequently Asked Questions

Why have I been prescribed KOGENATE® Bayer?

You’ve been prescribed KOGENATE® Bayer because you have haemophilia A. KOGENATE® Bayer replaces the factor VIII your body can’t produce and helps control bleeds.

What is KOGENATE® Bayer?

KOGENATE® Bayer is a recombinant factor VIII product (rFVIII). It’s a genetically engineered form of factor VIII produced for people with haemophilia A.

How is KOGENATE® Bayer supplied?

KOGENATE® Bayer is supplied as a powder in a single‑use bottle (known as a vial) with a pre‑filled syringe and vial adapter for reconstitution.

More information about KOGENATE® Bayer is available in the
patient information leaflet.

How do I store KOGENATE® Bayer?

Before infusion, KOGENATE® Bayer should be kept in the fridge (2°C‑8°C, never frozen) inside its carton, for a maximum of 30 months. It can also be stored at room temperature (25°C or less) for up to 12 months from the date it was taken out of the fridge. The vial should not be taken out of its outer carton or left in direct sunlight, and the expiry date should never be exceeded.

How do I manage my records?

When you take a vial out of the fridge, make sure you write the date 12 months from that point on the expiry label. This is the new expiry date. To help you keep track of your infusions, peel off the label when the vial is empty and stick it in your treatment diary.

Does KOGENATE® Bayer have other side effects?

Most people do not experience side effects with KOGENATE® Bayer. The most common effect is a rash, itch, temporary redness or burning sensation around the injection site. These effects often pass, however if you do experience any side effect, contact your haemophilia doctor or nurse immediately.

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 By reporting side effects you can help provide more information on the safety of this medicine.

You can learn more about KOGENATE® Bayer in the
patient information leaflet.

What is prophylaxis?

In haemophilia, prophylactic treatment is designed to stop bleeds from happening. Whereas on‑demand treatment means you infuse after a bleed, prophylaxis means you infuse every other day, or three times a week, to make sure that there is sufficient factor in your blood should you injure yourself.