Drug interactions
Loxapine + Venlafaxine
Severity: Moderate
Loxapine and Venlafaxine: 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
Combining venlafaxine with loxapine may increase serotonergic activity and dopamine blockade, rarely leading to serotonin syndrome or neuroleptic malignant syndrome. Additive sedation and seizure threshold lowering may also occur.
What this interaction means in plain words
Loxapine and Venlafaxine 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 belongs to Central Nervous System; Venlafaxine belongs to Central Nervous System.
Why it happens
Additive serotonergic and dopamine-antagonist pharmacodynamic effects.
What to do
Monitor for mental status change, hyperthermia, rigidity, clonus and autonomic instability, particularly after dose changes. Discontinue both agents and provide supportive care if either syndrome is suspected.
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 Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine 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 Loxapine with Venlafaxine?
MediHelp rates the interaction as moderate. Loxapine and Venlafaxine 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. Combining venlafaxine with loxapine may increase serotonergic activity and dopamine blockade, rarely leading to serotonin syndrome or neuroleptic malignant syndrome. Additive sedation and seizure threshold lowering may also occur.
How serious is the interaction between Loxapine and Venlafaxine?
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 for mental status change, hyperthermia, rigidity, clonus and autonomic instability, particularly after dose changes. Discontinue both agents and provide supportive care if either syndrome is suspected.
What other medicines interact with Venlafaxine?
MediHelp also lists interactions of Venlafaxine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Venlafaxine page.
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