Drug interactions
Dextroamphetamine + Fluphenazine
Severity: Moderate
Dextroamphetamine and Fluphenazine: 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
Antipsychotics such as fluphenazine block dopamine receptors, while amphetamines increase dopamine release, so each can blunt the intended effect of the other. Stimulants can worsen psychosis and antipsychotics may reduce stimulant benefit. Both drug classes can also affect cardiac conduction and heart rate.
What this interaction means in plain words
Dextroamphetamine and Fluphenazine 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.
Dextroamphetamine belongs to Central Nervous System; Fluphenazine belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism at dopaminergic pathways, with possible additive cardiac effects.
What to do
Monitor mental state, psychotic symptoms and heart rate or ECG when the two are combined, and reassess the need for the stimulant if psychosis worsens.
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 Dextroamphetamine
- Dextroamphetamine + Isocarboxazid Contraindicated
- Dextroamphetamine + Linezolid Contraindicated
- Dextroamphetamine + Methylene blue Contraindicated
- Dextroamphetamine + Phenelzine Contraindicated
- Dextroamphetamine + Rasagiline Contraindicated
- Dextroamphetamine + 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 Dextroamphetamine with Fluphenazine?
MediHelp rates the interaction as moderate. Dextroamphetamine and Fluphenazine 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. Antipsychotics such as fluphenazine block dopamine receptors, while amphetamines increase dopamine release, so each can blunt the intended effect of the other. Stimulants can worsen psychosis and antipsychotics may reduce stimulant benefit. Both drug classes can also affect cardiac conduction and heart rate.
How serious is the interaction between Dextroamphetamine and Fluphenazine?
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 mental state, psychotic symptoms and heart rate or ECG when the two are combined, and reassess the need for the stimulant if psychosis worsens.
What other medicines interact with Dextroamphetamine?
MediHelp also lists interactions of Dextroamphetamine with, for example, Isocarboxazid, Linezolid, Methylene blue. The full list is on the Dextroamphetamine page.
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