Amitriptyline and S-Adenosylmethionine: 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
S-Adenosylmethionine
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.
Both amitriptyline (Elavil) and SAMe raise serotonin, a chemical messenger in your body. Amitriptyline is a tricyclic antidepressant, and SAMe is a supplement often taken for mood or joint support. When you take both, the serotonin effects can add up.
Rarely, this can lead to something called serotonin syndrome. Early warning signs include feeling restless or anxious, confusion, sweating, shivering, a fast heartbeat, or muscle twitching. This is uncommon and usually builds up over time rather than all at once. The good news is your care team can manage this easily by starting low, going slow, and watching for those early signs. Please don't stop either one on your own, just check in with your pharmacist or doctor.
Effect: Additive serotonergic activity raising the risk of serotonin syndrome (agitation, myoclonus, hyperreflexia, diaphoresis, hyperthermia, autonomic and mental status changes).
Mechanism: Pharmacodynamic (additive), not a CYP-based PK interaction. Amitriptyline inhibits serotonin reuptake; SAMe contributes serotonergic tone. Neither agent's effect here depends on prodrug activation.
- Direction: Increased serotonergic effect (additive).
- Onset: Delayed.
- Evidence: Probable (single TCA case report with clomipramine; class-extrapolated).
- Management: If used together, initiate low doses of each and titrate slowly. Monitor for early signs (rising anxiety, confusion, disorientation, tremor, diaphoresis).
What happens
An increased risk of serotonin syndrome (hypertension, hyperthermia, myoclonus, mental status changes)
Interaction Deep Dive
There is one documented case in which serotonin syndrome was attributed most probably to co-administration of S-adenosylmethionine (SAMe) with clomipramine2. In a clinical study of 40 patients, SAMe was found to accelerate how quickly imipramine produced its therapeutic effect, and this occurred without serotonergic adverse reactions3. Patients starting on both SAMe and a tricyclic antidepressant warrant careful observation for the early manifestations of serotonin syndrome. This syndrome reflects excessive serotonergic stimulation and presents with restlessness, myoclonus, altered mental status, hyperreflexia, diaphoresis, shivering, and tremor. Failure to identify and appropriately manage the syndrome can be fatal1.
Why it happens (mechanism)
Additive pharmacologic effects resulting in excessive serotonergic stimulation
How to manage this interaction
This combination can be used with care, but your care team will watch you closely.
- Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise.
- Your team may start each at a low dose and increase slowly, individualizing your dose rather than rushing.
- Watch for early signs: increasing anxiety, confusion, disorientation, sweating, shivering, muscle twitching, tremor, or a racing heart.
- Tell your pharmacist that you take SAMe, since it is a supplement that may not be on your medication list.
If you notice several of these symptoms together, contact your care team promptly.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) A 71 year-old woman was admitted to the hospital presenting with anxiety, agitation, confusion, and features of serotonin syndrome. For 10 days she had received S-adenosylmethionine 100 milligrams (mg) intramuscularly once daily along with clomipramine 25 mg daily, after which the clomipramine was raised to 75 mg/day. Between 48 and 72 hours following this dosage increase, she progressively developed anxiety, agitation, and confusion. At admission she did not respond verbally and was stuporous, with a heart rate of 130 beats/minute, a respiratory rate of 30 breaths/minute, a temperature of 40.5 degrees Celsius, diarrhea, myoclonus, generalized tremors, rigidity, hyperreflexia, shivering, diaphoresis, and dehydration. Her temperature rose to 43 degrees Celsius while hospitalized, without any documented infection. Her white blood cell count (WBC) was 13,040 mm3, lactic dehydrogenase was 662 units/liter (U/L), creatine phosphokinase was 8920 U/L, serum potassium was 2.7 milliequivalents/liter (mEq/L), and creatinine was 1.1 mg/100 milliliter (mL) (laboratory reference values were not provided). A cranial computed tomography (CT) scan showed no abnormalities. The patient was not receiving neuroleptics. Serum levels of benzodiazepine and tricyclic antidepressant were within normal limits. Her symptoms gradually resolved after 4 days of hydration and supportive care. It was suggested that the interaction stemmed from the synergistic activity of S-adenosylmethionine and clomipramine 2.
Common questions
Can I take Amitriptyline and S-Adenosylmethionine together?
Taking amitriptyline with SAMe adds their serotonin effects and can rarely cause serotonin syndrome, so start low, go slow, and watch for early signs like anxiety, confusion, sweating, or twitching. Keep your care team in the loop and don't change either medicine on your own. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and S-Adenosylmethionine interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How is the Amitriptyline and S-Adenosylmethionine interaction managed?
This combination can be used with care, but your care team will watch you closely. Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise. Your team may start each at a low dose and increase slowly, individualizing your dose rather than rushing. Watch for early signs: increasing anxiety, confusion, disorientation, sweating, shivering, muscle twitching, tremor, or a rac… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
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 S-Adenosylmethionine 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 anything you'd monitor while I'm on both?
References (3)
- Sternbach H: The serotonin syndrome. Am J Psychiatr 1991; 148:705-713. PubMed
- Iruela LM, Minguez L, Merino J, et al: Toxic interaction of S-adenosylmethionine and clomipramine. Am J Psychiatry 1993; 150(3):522. PubMed
- Berlanga C, Ortega-Soto HA, Ontiveros M, et al: Efficacy of S-adenosyl-L-methionine in speeding the onset of action of imipramine. Psychiatry Res 1992; 44(3):257-262. PubMed
Keep reading about Amitriptyline
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