Drug interactions
Fluphenazine + Methamphetamine
Severity: Moderate
Fluphenazine and Methamphetamine: 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
Fluphenazine blocks dopamine receptors and can oppose the effects of methamphetamine, and the stimulant may worsen psychosis that fluphenazine is treating. Both can affect cardiac conduction and blood pressure, so arrhythmia risk may increase in susceptible patients.
What this interaction means in plain words
Fluphenazine and Methamphetamine 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; Methamphetamine belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism at dopamine receptors with additive cardiovascular and QT effects.
What to do
Monitor psychiatric symptoms, blood pressure, heart rate and ECG in patients with cardiac risk factors. Correct electrolyte abnormalities and avoid other QT-prolonging drugs.
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 Methamphetamine
- Isocarboxazid + Methamphetamine Contraindicated
- Linezolid + Methamphetamine Contraindicated
- Methamphetamine + Phenelzine Contraindicated
- Methamphetamine + Procarbazine Contraindicated
- Methamphetamine + Rasagiline Contraindicated
- Methamphetamine + Safinamide Contraindicated
Other interactions of Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Frequently asked questions
Can I take Fluphenazine with Methamphetamine?
MediHelp rates the interaction as moderate. Fluphenazine and Methamphetamine 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 blocks dopamine receptors and can oppose the effects of methamphetamine, and the stimulant may worsen psychosis that fluphenazine is treating. Both can affect cardiac conduction and blood pressure, so arrhythmia risk may increase in susceptible patients.
How serious is the interaction between Fluphenazine and Methamphetamine?
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 psychiatric symptoms, blood pressure, heart rate and ECG in patients with cardiac risk factors. Correct electrolyte abnormalities and avoid other QT-prolonging drugs.
What other medicines interact with Methamphetamine?
MediHelp also lists interactions of Methamphetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Methamphetamine page.
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