Drug interactions
Fluphenazine + Isoproterenol
Severity: Moderate
Fluphenazine and Isoproterenol: 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
Phenothiazines block alpha-adrenergic receptors and can cause vasodilation, so with a beta-agonist such as isoproterenol the hypotensive effect and reflex tachycardia may be exaggerated. Isoproterenol can also provoke arrhythmias, which may be more likely in patients with QT-prolonging drugs on board.
What this interaction means in plain words
Fluphenazine and Isoproterenol 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.
Fluphenazine belongs to Central Nervous System; Isoproterenol belongs to Respiratory.
Why it happens
Alpha-adrenergic blockade by fluphenazine combined with beta-adrenergic vasodilation, plus additive proarrhythmic potential.
What to do
Monitor blood pressure, heart rate and ECG during isoproterenol therapy, and correct electrolyte disturbances. Titrate isoproterenol carefully in patients on fluphenazine.
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 Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Other interactions of Isoproterenol
Frequently asked questions
Can I take Fluphenazine with Isoproterenol?
MediHelp rates the interaction as moderate. Fluphenazine and Isoproterenol 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. Phenothiazines block alpha-adrenergic receptors and can cause vasodilation, so with a beta-agonist such as isoproterenol the hypotensive effect and reflex tachycardia may be exaggerated. Isoproterenol can also provoke arrhythmias, which may be more likely in patients with QT-prolonging drugs on board.
How serious is the interaction between Fluphenazine and Isoproterenol?
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, heart rate and ECG during isoproterenol therapy, and correct electrolyte disturbances. Titrate isoproterenol carefully in patients on fluphenazine.
What other medicines interact with Fluphenazine?
MediHelp also lists interactions of Fluphenazine with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Fluphenazine page.
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