Drug interactions
Amlodipine-valsartan + St john's wort
Severity: Moderate
Amlodipine-valsartan and St john's wort: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
St John's wort induces intestinal and hepatic CYP3A4 and P-glycoprotein, which can lower amlodipine exposure. Blood pressure control may be reduced, and the effect may persist for some time after the herb is stopped.
What this interaction means in plain words
Amlodipine-valsartan and St john's wort can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Induction of CYP3A4 by St John's wort increases amlodipine metabolism and lowers plasma concentrations.
What to do
Monitor blood pressure and consider stopping the herbal product or titrating the amlodipine dose. Recheck blood pressure after the herb is discontinued, as amlodipine levels may rise again.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Amlodipine-valsartan
- Aliskiren + Amlodipine-valsartan Contraindicated
- Amlodipine-valsartan + Sparsentan Contraindicated
- Aldesleukin + Amlodipine-valsartan Major
- Amifostine + Amlodipine-valsartan Major
- Amiloride + Amlodipine-valsartan Major
- Amlodipine-valsartan + Benazepril Major
Frequently asked questions
Can I take Amlodipine-valsartan with St john's wort?
MediHelp rates the interaction as moderate. Amlodipine-valsartan and St john's wort can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. St John's wort induces intestinal and hepatic CYP3A4 and P-glycoprotein, which can lower amlodipine exposure. Blood pressure control may be reduced, and the effect may persist for some time after the herb is stopped.
How serious is the interaction between Amlodipine-valsartan and St john's wort?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and consider stopping the herbal product or titrating the amlodipine dose. Recheck blood pressure after the herb is discontinued, as amlodipine levels may rise again.
What other medicines interact with Amlodipine-valsartan?
MediHelp also lists interactions of Amlodipine-valsartan with, for example, Aliskiren, Sparsentan, Aldesleukin. The full list is on the Amlodipine-valsartan page.
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