Amitriptyline and Abiraterone Acetate, Micronized: 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
Abiraterone Acetate, Micronized
Amitriptyline
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.
Let's talk about taking abiraterone (Zytiga, Yonsa) together with amitriptyline (Elavil). Abiraterone can slow down the enzyme in your body that breaks amitriptyline down. When that happens, more amitriptyline can build up than usual. That could mean stronger side effects, like extra drowsiness, dizziness, dry mouth, constipation, or a faster heartbeat.
The good news is this is a theoretical concern, meaning it is based on how the drugs work rather than lots of real-world reports. Your care team can manage it easily by watching how you feel, checking blood levels if needed, and fine-tuning your amitriptyline dose. Just don't change anything on your own, and let your pharmacist or doctor know if you feel off.
Effect: Increased amitriptyline exposure via abiraterone inhibition of CYP2D6, the primary enzyme metabolizing amitriptyline (a CYP2D6 substrate). Amitriptyline is the active drug, so reduced clearance raises plasma levels and anticholinergic, sedative, cardiac (QT/conduction), and CNS effects.
- Direction: Increased amitriptyline concentration/AUC.
- Evidence: Theoretical; magnitude and onset unspecified.
- At-risk: CYP2D6 poor metabolizers.
- Management: Use caution; monitor for TCA toxicity, obtain amitriptyline plasma levels, and individualize/reduce dose as needed. If abiraterone is stopped, an amitriptyline dose increase may be warranted.
What happens
Increased exposure of amitriptyline
Interaction Deep Dive
Because amitriptyline is a substrate of CYP2D6, taking it together with a CYP2D6 inhibitor can raise amitriptyline exposure, with poor metabolizers facing particular risk. When such combined use cannot be avoided, exercise caution and keep the patient under close observation. It is also advisable to check amitriptyline plasma concentrations and modify the dose as necessary. Should the CYP2D6 inhibitor be stopped, the amitriptyline dose may need to be raised1.
Why it happens (mechanism)
Inhibition of CYP2D6-mediated metabolism of amitriptyline
How to manage this interaction
If your care team prescribes both, keep taking them exactly as directed. They can manage this combination safely.
- Your team may monitor you more closely for signs of too much amitriptyline (drowsiness, dizziness, dry mouth, constipation, confusion, or heart-rhythm changes).
- They may check amitriptyline blood levels and adjust your dose to fit you.
- If abiraterone is ever stopped, your amitriptyline dose may need to go back up.
Do not start, stop, or change either medication on your own. Tell your pharmacist or prescriber about any new or worsening symptoms so they can tailor your treatment.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Abiraterone Acetate, Micronized together?
Abiraterone may raise amitriptyline levels and side effects by slowing its breakdown, so your care team may monitor you, check blood levels, and adjust the amitriptyline dose. Keep taking both as prescribed and report any new symptoms. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Abiraterone Acetate, Micronized interaction?
It is rated moderate. Can be significant — usually manageable with 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 Abiraterone Acetate, Micronized interaction managed?
If your care team prescribes both, keep taking them exactly as directed. They can manage this combination safely. Your team may monitor you more closely for signs of too much amitriptyline (drowsiness, dizziness, dry mouth, constipation, confusion, or heart-rhythm changes). They may check amitriptyline blood levels and adjust your dose to fit you. If abiraterone is ever stopped, your amitriptyline… 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 Abiraterone Acetate, Micronized 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 (1)
- Product Information: amitriptyline HCl oral tablet, amitriptyline HCl oral tablet. RemedyRepack Inc. (per DailyMed), Indiana, PA, 2010. DailyMed
Keep reading about Abiraterone Acetate, Micronized
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