Serious. These medicines may interact and cause very harmful effects. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
Both of these medicines affect your immune system.
What might happen:
When these medicines are used together, your risk of developing a serious infection may increase.
What you should do about this interaction:
Let your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together. Your doctor may want to monitor the number of white blood cells in your blood while you are taking these medicines together. If you have any symptoms of an infection, notify your doctor right away.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.Reference:1.Entyvio (vedolizumab) US prescribing information. Takeda Pharmaceuticals America, Inc. May, 2014.