Drug interactions
Dextroamphetamine + L-tryptophan
Severity: Moderate
Dextroamphetamine 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
Tryptophan is a serotonin precursor and amphetamine promotes serotonin release, so the combination might raise serotonin activity. Serotonin syndrome is possible but reports are rare.
What this interaction means in plain words
Dextroamphetamine 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
Additive serotonergic effects via increased serotonin synthesis and release.
What to do
Monitor for agitation, tremor, hyperreflexia, sweating or fever when combining. Stop tryptophan if serotonin toxicity 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 Dextroamphetamine
- Dextroamphetamine + Isocarboxazid Contraindicated
- Dextroamphetamine + Linezolid Contraindicated
- Dextroamphetamine + Methylene blue Contraindicated
- Dextroamphetamine + Phenelzine Contraindicated
- Dextroamphetamine + Rasagiline Contraindicated
- Dextroamphetamine + Safinamide Contraindicated
Frequently asked questions
Can I take Dextroamphetamine with L-tryptophan?
MediHelp rates the interaction as moderate. Dextroamphetamine 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. Tryptophan is a serotonin precursor and amphetamine promotes serotonin release, so the combination might raise serotonin activity. Serotonin syndrome is possible but reports are rare.
How serious is the interaction between Dextroamphetamine 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: Monitor for agitation, tremor, hyperreflexia, sweating or fever when combining. Stop tryptophan if serotonin toxicity is suspected.
What other medicines interact with Dextroamphetamine?
MediHelp also lists interactions of Dextroamphetamine with, for example, Isocarboxazid, Linezolid, Methylene blue. The full list is on the Dextroamphetamine page.
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