Amitriptyline and Hydroxyamphetamine: 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
Amitriptyline
Hydroxyamphetamine
No brand names on record
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's going on. Both amitriptyline (Elavil) and hydroxyamphetamine can raise the activity of serotonin, a chemical messenger in your brain. When two medicines push serotonin up at the same time, there is a small chance it can climb too high, causing something called serotonin syndrome.
Signs to watch for include feeling agitated or restless, a fast heartbeat, sweating, shaking, muscle twitching, or a high temperature. This concern is mostly theoretical, so please don't panic. The good news is your care team can manage this by starting low, going slow, and keeping an eye on you. If anything feels off, reach out to your pharmacist or doctor.
Mechanism: additive serotonergic activity. Amitriptyline (a TCA) inhibits serotonin reuptake, and hydroxyamphetamine (a sympathomimetic amine) can promote monoamine release; combined effect may increase serotonin syndrome risk. Neither is a prodrug relevant here.
- Direction: additive PD serotonergic effect; potential sustained CNS amphetamine levels and potentiated cardiovascular effects.
- Evidence: theoretical.
- Severity/onset: major; onset unspecified.
- Management: if coadministration is required, initiate at lower doses, monitor closely during initiation and titration (mental status, neuromuscular signs, autonomic instability, vitals). Discontinue both agents if serotonin syndrome is suspected.
What happens
An increased risk of serotonin syndrome
Interaction Deep Dive
Giving an amphetamine together with another serotonergic drug can lead to serotonin syndrome, since each of these agents acts on the serotonergic neurotransmitter system12. There may also be prolonged elevations of d-amphetamine levels within the brain, along with a potentiation of cardiovascular effects1. When the combined use of an amphetamine and such an agent is judged clinically necessary, begin with reduced doses and observe patients closely, particularly at the start of therapy and when doses are being changed. Should serotonin syndrome be suspected, stop both medications32.
Why it happens (mechanism)
Additive serotonergic effects
How to manage this interaction
What your care team may do:
- If both drugs are truly needed, start at lower doses and adjust gradually, individualized to you.
- Monitor you more closely, especially when starting or changing a dose.
- Watch your heart rate and blood pressure, since these effects may be increased.
What you can do: Keep taking both exactly as prescribed unless told otherwise. Tell your pharmacist or prescriber about agitation, confusion, fast heartbeat, sweating, shivering, muscle twitching, or fever. If several of these appear together, seek medical help promptly.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Hydroxyamphetamine together?
Taking amitriptyline with hydroxyamphetamine can add up serotonin effects and, in theory, raise the risk of serotonin syndrome. Keep taking both as prescribed, and tell your care team so they can start low, monitor you, and watch for warning signs. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Hydroxyamphetamine 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 Amitriptyline and Hydroxyamphetamine interaction managed?
What your care team may do: If both drugs are truly needed, start at lower doses and adjust gradually, individualized to you. Monitor you more closely, especially when starting or changing a dose. Watch your heart rate and blood pressure, since these effects may be increased. What you can do: Keep taking both exactly as prescribed unless told otherwise. Tell your pharmacist or prescriber about agi… 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Amitriptyline or Hydroxyamphetamine 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 (3)
- Product Information: VYVANSE(R) oral capsules, oral chewable tablets, lisdexamfetamine dimesylate oral capsules, oral chewable tablets. Shire US Inc (per DailyMed), Lexington, MA, 2018. DailyMed
- Product Information: FETZIMA(R) oral extended-release capsules, levomilnacipran oral extended-release capsules. AbbVie Inc (per FDA), North Chicago, IL, 2023. DailyMed
- Product Information: ADDERALL(R) oral tablets, dextroamphetamine saccharate amphetamine aspartate dextroamphetamine sulfate amphetamine sulfate oral tablets. Teva Select Brands (per FDA), Horsham, PA, 2017. DailyMed
Keep reading about Amitriptyline
Keep reading about Hydroxyamphetamine
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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