Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
The cause of this interaction is not known. Taking these two medicines together may cause your body to process your blood pressure medicine more rapidly.
What might happen:
Your blood pressure medicine may not work as well.
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 check your blood pressure more often and may want to change your blood pressure medicine.Contact your doctor if you have an increase in blood pressure or experience blurred vision, dizziness, or headaches.Your healthcare professionals (e.g. doctor or pharmacist) 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.Plendil (felodipine) US prescribing information. AstraZeneca Pharmaceuticals LP November, 2003.
2.Capewell S, Freestone S, Critchley JA, Pottage A, Prescott LF. Reduced felodipine bioavailability in patients taking anticonvulsants. Lancet 1988 Aug 27;2(8609):480-2.