Drug interactions
Phentolamine + Zotepine
Severity: Moderate
Phentolamine and Zotepine: 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 have alpha-1 adrenergic blocking activity, so combined use can cause additive hypotension and orthostatic dizziness. Reflex tachycardia may also occur, and zotepine adds QT and seizure risk.
What this interaction means in plain words
Phentolamine and Zotepine 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 alpha-adrenergic antagonism produces vasodilation and hypotension.
What to do
Monitor blood pressure and heart rate, especially at initiation and dose increases, and counsel patients about orthostatic symptoms.
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 Phentolamine with Zotepine?
MediHelp rates the interaction as moderate. Phentolamine and Zotepine 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 have alpha-1 adrenergic blocking activity, so combined use can cause additive hypotension and orthostatic dizziness. Reflex tachycardia may also occur, and zotepine adds QT and seizure risk.
How serious is the interaction between Phentolamine and Zotepine?
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, especially at initiation and dose increases, and counsel patients about orthostatic symptoms.
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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