Drug interactions
Lisdexamfetamine + Loxapine
Severity: Moderate
Lisdexamfetamine and Loxapine: 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
Loxapine is a dopamine-blocking antipsychotic, whereas amphetamines increase dopaminergic and noradrenergic activity, so each may blunt the other's intended effect. Stimulants may also worsen psychosis, while loxapine can contribute to sedation and QT or extrapyramidal effects.
What this interaction means in plain words
Lisdexamfetamine and Loxapine 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.
Lisdexamfetamine belongs to Central Nervous System; Loxapine belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism between dopamine receptor blockade and amphetamine-mediated catecholamine release.
What to do
Monitor psychiatric symptoms, the efficacy of both agents and extrapyramidal signs. Avoid stimulants in patients with active psychosis unless clearly indicated.
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 Lisdexamfetamine
- Isocarboxazid + Lisdexamfetamine Contraindicated
- Linezolid + Lisdexamfetamine Contraindicated
- Lisdexamfetamine + Phenelzine Contraindicated
- Lisdexamfetamine + Procarbazine Contraindicated
- Lisdexamfetamine + Rasagiline Contraindicated
- Lisdexamfetamine + Safinamide Contraindicated
Other interactions of Loxapine
- Alfentanil + Loxapine Major
- Alprazolam + Loxapine Major
- Amisulpride + Loxapine Major
- Amoxapine + Loxapine Major
- Apomorphine + Loxapine Major
- Belladonna and opium + Loxapine Major
Frequently asked questions
Can I take Lisdexamfetamine with Loxapine?
MediHelp rates the interaction as moderate. Lisdexamfetamine and Loxapine 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. Loxapine is a dopamine-blocking antipsychotic, whereas amphetamines increase dopaminergic and noradrenergic activity, so each may blunt the other's intended effect. Stimulants may also worsen psychosis, while loxapine can contribute to sedation and QT or extrapyramidal effects.
How serious is the interaction between Lisdexamfetamine and Loxapine?
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, the efficacy of both agents and extrapyramidal signs. Avoid stimulants in patients with active psychosis unless clearly indicated.
What other medicines interact with Lisdexamfetamine?
MediHelp also lists interactions of Lisdexamfetamine with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Lisdexamfetamine page.
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