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:
St. John's Wort may speed up how quickly your liver processes fesoterodine.
What might happen:
The amount of fesoterodine and the active metabolites in your blood may decrease and they may not work as well.
What you should do about this interaction:
If you notice that your fesoterodine is not working as well, contact your healthcare professional (e.g. doctor or pharmacist). Your doctor may want to increase the dose of your medicine while you are taking your St. John's Wort.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.Toviaz (fesoterodine) UK summary of product characteristics. Pfizer Limited February, 2011.
2.Toviaz (fesoterodine fumarate) US prescribing information. Pfizer August, 2012.