Drug interactions
Clozapine + Phenylephrine po
Severity: Minor
Clozapine and Phenylephrine po: minor 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
Oral phenylephrine is an alpha agonist that may raise blood pressure and heart rate, and clozapine's alpha blockade may blunt the pressor effect while tachycardia persists. The net effect is unpredictable but usually modest.
What this interaction means in plain words
Clozapine and Phenylephrine po have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Opposing alpha-adrenergic pharmacodynamic effects.
What to do
Monitor blood pressure and heart rate if used regularly; short-term use at standard doses generally needs no change.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Clozapine
- Clozapine + Deferiprone Contraindicated
- Clozapine + Irinotecan Contraindicated
- Clozapine + Pimozide Contraindicated
- Clozapine + Thioridazine Contraindicated
- Acalabrutinib + Clozapine Major
- Adagrasib + Clozapine Major
Frequently asked questions
Can I take Clozapine with Phenylephrine po?
MediHelp rates the interaction as minor. Clozapine and Phenylephrine po have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Oral phenylephrine is an alpha agonist that may raise blood pressure and heart rate, and clozapine's alpha blockade may blunt the pressor effect while tachycardia persists. The net effect is unpredictable but usually modest.
How serious is the interaction between Clozapine and Phenylephrine po?
MediHelp rates it minor, 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 if used regularly; short-term use at standard doses generally needs no change.
What other medicines interact with Clozapine?
MediHelp also lists interactions of Clozapine with, for example, Deferiprone, Irinotecan, Pimozide. The full list is on the Clozapine page.
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