Drug interactions
Paroxetine + Venlafaxine
Severity: Major
Paroxetine and Venlafaxine: major 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 an SSRI with an SNRI increases the likelihood of serotonin syndrome. Paroxetine is a strong CYP2D6 inhibitor and can raise venlafaxine concentrations while lowering formation of its active metabolite, increasing serotonergic and noradrenergic effects such as hypertension.
What this interaction means in plain words
Paroxetine and Venlafaxine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Paroxetine belongs to Central Nervous System; Venlafaxine belongs to Central Nervous System.
Why it happens
Additive serotonin reuptake inhibition plus paroxetine inhibition of CYP2D6-mediated venlafaxine metabolism.
What to do
Avoid concurrent use; choose a single agent or a non-serotonergic alternative. If unavoidable, use low doses and monitor blood pressure and for serotonin syndrome.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Paroxetine
- Isocarboxazid + Paroxetine Contraindicated
- Methylene blue + Paroxetine Contraindicated
- Paroxetine + Phenelzine Contraindicated
- Paroxetine + Pimozide Contraindicated
- Paroxetine + Procarbazine Contraindicated
- Paroxetine + Selegiline Contraindicated
Other interactions of Venlafaxine
- Isocarboxazid + Venlafaxine Contraindicated
- Methylene blue + Venlafaxine Contraindicated
- Phenelzine + Venlafaxine Contraindicated
- Procarbazine + Venlafaxine Contraindicated
- Rasagiline + Venlafaxine Contraindicated
- Safinamide + Venlafaxine Contraindicated
Frequently asked questions
Can I take Paroxetine with Venlafaxine?
MediHelp rates the interaction as major. Paroxetine and Venlafaxine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Combining an SSRI with an SNRI increases the likelihood of serotonin syndrome. Paroxetine is a strong CYP2D6 inhibitor and can raise venlafaxine concentrations while lowering formation of its active metabolite, increasing serotonergic and noradrenergic effects such as hypertension.
How serious is the interaction between Paroxetine and Venlafaxine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use; choose a single agent or a non-serotonergic alternative. If unavoidable, use low doses and monitor blood pressure and for serotonin syndrome.
What other medicines interact with Paroxetine?
MediHelp also lists interactions of Paroxetine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Paroxetine page.
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