Drug interactions
Desvenlafaxine + L-tryptophan
Severity: Moderate
Desvenlafaxine and L-tryptophan: 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
L-tryptophan is a serotonin precursor, and combining it with desvenlafaxine can raise synaptic serotonin enough to cause serotonin syndrome. Cases have mostly been reported with other serotonergic antidepressants.
What this interaction means in plain words
Desvenlafaxine and L-tryptophan 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.
Why it happens
Increased serotonin synthesis together with reuptake inhibition produces additive serotonergic effects.
What to do
Avoid unsupervised tryptophan supplements and monitor for serotonin toxicity if used. Stop tryptophan if symptoms occur.
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 Desvenlafaxine
- Desvenlafaxine + Isocarboxazid Contraindicated
- Desvenlafaxine + Methylene blue Contraindicated
- Desvenlafaxine + Phenelzine Contraindicated
- Desvenlafaxine + Rasagiline Contraindicated
- Desvenlafaxine + Safinamide Contraindicated
- Desvenlafaxine + Selegiline Contraindicated
Frequently asked questions
Can I take Desvenlafaxine with L-tryptophan?
MediHelp rates the interaction as moderate. Desvenlafaxine and L-tryptophan 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. L-tryptophan is a serotonin precursor, and combining it with desvenlafaxine can raise synaptic serotonin enough to cause serotonin syndrome. Cases have mostly been reported with other serotonergic antidepressants.
How serious is the interaction between Desvenlafaxine and L-tryptophan?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid unsupervised tryptophan supplements and monitor for serotonin toxicity if used. Stop tryptophan if symptoms occur.
What other medicines interact with Desvenlafaxine?
MediHelp also lists interactions of Desvenlafaxine with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Desvenlafaxine page.
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