This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.
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:
Ritonavir may speed up how quickly your liver processes ulipristal. This effect may last for 2-3 weeks after you stop taking these medicines.
What might happen:
Ulipristal may not be as effective if you are taking or have taken ritonavir in the previous 3 weeks.
What you should do about this interaction:
Make sure your healthcare professionals (e.g. doctor or pharmacist) know that you are taking these medicines together. Discuss your options with your healthcare provider.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.
1.Ellaone (ulipristal acetate) UK summary of product characteristics. HRA Pharma UK Ltd May 15, 2009..