Yes, you’ll need to be tested for hepatitis B before you start taking Ocrevus. This is important because Ocrevus will weaken your immune system. Therefore, if you have hepatitis B, your body won’t be able to fight the infection. This can lead to serious liver problems.
In some cases, your doctor may also do an MRI scan of your brain. This is a way for your doctor to see an image of your brain. An MRI can show if the medication is working for your MS or if the damage (sometimes called lesions) is getting worse.
Talk with your doctor if you have any questions about testing that needs to be done before you start taking Ocrevus.