Dextroamphetamine and Dupilumab Injection: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Dextroamphetamine
Dupilumab Injection
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Here's what this means for you. Dextroamphetamine (a stimulant for ADHD) is normally broken down by a liver enzyme called CYP2D6. The listed concern is that a CYP2D6 blocker could slow that breakdown, letting more of the stimulant build up in your body. That could mean stronger effects and a higher chance of a rare but serious reaction called serotonin syndrome (things like a fast heart rate, sweating, shakiness, agitation, or stomach upset).
Please note this warning is theoretical, meaning it's based on how these drugs work rather than proven cases. Keep taking both as prescribed, and let your care team know if you feel unusually jittery or unwell. They can manage this by adjusting your dose and watching you closely.
Mechanism/direction: Dextroamphetamine is partly metabolized by CYP2D6. A CYP2D6 inhibitor may reduce its clearance, increasing dextroamphetamine exposure (AUC/Cmax), with additive serotonergic effects raising serotonin syndrome risk. Lisdexamfetamine is a prodrug of dextroamphetamine and is affected similarly.
- Note: Dupilumab is a monoclonal antibody; its CYP-modulating potential is indirect (via normalization of cytokine-suppressed CYP activity in chronic inflammation), so any CYP2D6 effect is uncertain.
- Evidence: theoretical. Onset: unspecified. Severity on file: major.
- Management: if co-use warranted, consider lower initial stimulant dose; monitor for serotonin syndrome (mental status changes, autonomic instability, neuromuscular signs, GI symptoms), especially at initiation and dose increases. Discontinue if it develops.
What happens
Increased dextroamphetamine or lisdexamfetamine (prodrug of dextroamphetamine) exposure and an increased risk of serotonin syndrome
Interaction Deep Dive
Taking dextroamphetamine or lisdexamfetamine (a prodrug that converts to dextroamphetamine) together with CYP2D6 inhibitors can raise the exposure to dextroamphetamine, the active metabolite of lisdexamfetamine, relative to using the drug on its own, and can also heighten the likelihood of serotonin syndrome. When there is a clinical need to combine dextroamphetamine or lisdexamfetamine with CYP2D6 inhibitors, begin at reduced doses and watch patients for indications of serotonin syndrome, especially when dextroamphetamine or lisdexamfetamine is being started and following any dose increase. Manifestations of serotonin syndrome can involve altered mental status, autonomic instability, seizures, and/or gastrointestinal symptoms, as well as neuromuscular symptoms. Should serotonin syndrome develop, stop both dextroamphetamine or lisdexamfetamine and the CYP2D6 inhibitor. An alternative agent that does not inhibit CYP2D6 should be considered1.
Why it happens (mechanism)
Inhibition of CYP2D6-mediated metabolism of dextroamphetamine or lisdexamfetamine (prodrug of dextroamphetamine); additive serotonergic effects
How to manage this interaction
The good news: this is manageable. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise.
- Your care team may start or keep the stimulant at a lower dose and monitor you more closely, especially when starting it or after any dose increase.
- Watch for signs of serotonin syndrome: agitation or confusion, fast heart rate, high blood pressure, heavy sweating, tremor, muscle twitching, or stomach upset. Seek help promptly if these occur.
- Tell your pharmacist and prescriber you take both, so they can tailor your dose and, if needed, discuss alternatives.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Dextroamphetamine and Dupilumab Injection together?
Combining dextroamphetamine with dupilumab could theoretically raise stimulant levels and serotonin syndrome risk, so keep taking both as prescribed but watch for agitation, fast heart rate, sweating, or tremor and report them to your care team. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Dextroamphetamine and Dupilumab Injection interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Dextroamphetamine and Dupilumab Injection interaction managed?
The good news: this is manageable. Keep taking both medications exactly as prescribed unless your prescriber tells you otherwise. Your care team may start or keep the stimulant at a lower dose and monitor you more closely, especially when starting it or after any dose increase. Watch for signs of serotonin syndrome: agitation or confusion, fast heart rate, high blood pressure, heavy sweating, trem… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Dextroamphetamine or Dupilumab Injection need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (1)
- Product Information: ARYNTA(TM) oral solution, lisdexamfetamine dimesylate oral solution. Azurity Pharmaceuticals, Inc. (per FDA), Woburn, MA, 2025. DailyMed
Keep reading about Dextroamphetamine
Keep reading about Dupilumab Injection
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major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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