Drug interactions
Isradipine + Phentolamine
Severity: Moderate
Isradipine and Phentolamine: 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
Both drugs cause vasodilation through different pathways. Combined use may lead to excessive hypotension and reflex tachycardia.
What this interaction means in plain words
Isradipine and Phentolamine 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
Additive vasodilation from alpha-adrenergic blockade and calcium channel blockade.
What to do
Monitor blood pressure and heart rate, particularly at initiation or dose changes, and lower doses if symptomatic hypotension develops.
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 Phentolamine
Frequently asked questions
Can I take Isradipine with Phentolamine?
MediHelp rates the interaction as moderate. Isradipine and Phentolamine 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. Both drugs cause vasodilation through different pathways. Combined use may lead to excessive hypotension and reflex tachycardia.
How serious is the interaction between Isradipine and Phentolamine?
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 heart rate, particularly at initiation or dose changes, and lower doses if symptomatic hypotension develops.
What other medicines interact with Phentolamine?
MediHelp also lists interactions of Phentolamine with, for example, Alfuzosin, Avanafil, Doxazosin. The full list is on the Phentolamine page.
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