Drug interactions
L-tryptophan + Sertraline
Severity: Major
L-tryptophan and Sertraline: 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
L-tryptophan is a serotonin precursor, and combining it with an SSRI can increase serotonin activity enough to cause serotonin syndrome. Cases have been reported, mainly at higher tryptophan doses.
What this interaction means in plain words
L-tryptophan and Sertraline 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.
Why it happens
Increased serotonin synthesis from tryptophan combined with reuptake inhibition by sertraline.
What to do
Avoid the combination where possible or use low tryptophan doses with monitoring. Watch for agitation, tremor, hyperreflexia, diaphoresis and hyperthermia.
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 Sertraline
- Isocarboxazid + Sertraline Contraindicated
- Methylene blue + Sertraline Contraindicated
- Phenelzine + Sertraline Contraindicated
- Pimozide + Sertraline Contraindicated
- Selegiline transdermal + Sertraline Contraindicated
- Selegiline + Sertraline Contraindicated
Frequently asked questions
Can I take L-tryptophan with Sertraline?
MediHelp rates the interaction as major. L-tryptophan and Sertraline 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. L-tryptophan is a serotonin precursor, and combining it with an SSRI can increase serotonin activity enough to cause serotonin syndrome. Cases have been reported, mainly at higher tryptophan doses.
How serious is the interaction between L-tryptophan and Sertraline?
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 the combination where possible or use low tryptophan doses with monitoring. Watch for agitation, tremor, hyperreflexia, diaphoresis and hyperthermia.
What other medicines interact with Sertraline?
MediHelp also lists interactions of Sertraline with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Sertraline page.
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