Amitriptyline and Carisoprodol: 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
Carisoprodol
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 of these medicines can make you sleepy, and together that effect can add up. Amitriptyline (Elavil) is a tricyclic antidepressant that often causes drowsiness, and carisoprodol (Soma) is a muscle relaxant that also calms the nervous system. When you take them at the same time, you may feel more tired, foggy, or dizzy than you would with either one alone.
The good news is that this is very manageable. Don't stop either medicine on your own. Just let your doctor or pharmacist know you take both so they can watch how you're doing and adjust things if needed. Be extra careful driving until you know how the combination affects you.
Additive CNS depression between amitriptyline (a sedating tricyclic antidepressant) and carisoprodol (a centrally acting muscle relaxant whose metabolite meprobamate is itself sedating). This is a pharmacodynamic interaction, not a metabolic one, so no prodrug or enzyme considerations apply.
- Effect: increased sedation, psychomotor impairment, possible respiratory depression at higher exposures.
- Direction: additive/potentially synergistic CNS depression.
- Evidence: theoretical; severity rated major.
- Onset: unspecified.
Management: use lowest effective doses, counsel on impairment and avoiding other depressants (alcohol, opioids, benzodiazepines), and monitor for excess somnolence. Individualize dosing.
What happens
An increased risk of sedation
Interaction Deep Dive
Exercise care in patients who are using multiple CNS depressants at the same time. The sedative actions of carisoprodol and additional CNS depressants such as tricyclic antidepressants can be additive1.
Why it happens (mechanism)
Additive CNS depression
How to manage this interaction
Keep taking both medicines as prescribed unless your care team tells you otherwise. This interaction is about added drowsiness, and it is usually well managed.
- Tell your pharmacist and prescriber that you take both, so they can monitor you more closely.
- Your doses may need to be adjusted and individualized by your care team to keep sedation manageable.
- Avoid alcohol and other sedating medicines unless cleared by your provider.
- Be cautious driving or operating machinery until you know how you feel.
- Report heavy drowsiness, confusion, or slowed breathing right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Carisoprodol together?
Taking amitriptyline and carisoprodol together can add up to more drowsiness, so use both carefully, avoid alcohol, and let your care team know so they can adjust doses and monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Carisoprodol 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 Carisoprodol interaction managed?
Keep taking both medicines as prescribed unless your care team tells you otherwise. This interaction is about added drowsiness, and it is usually well managed. Tell your pharmacist and prescriber that you take both, so they can monitor you more closely. Your doses may need to be adjusted and individualized by your care team to keep sedation manageable. Avoid alcohol and other sedating medicines un… 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 Carisoprodol 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: CARISOPRODOL, ASPIRIN, CODEINE PHOSPHATE oral tablets, carisoprodol, aspirin, codeine phosphate oral tablets. Ingenus Pharmaceuticals LLC (per DailyMed), Orlando, FL, 2021. DailyMed
Keep reading about Amitriptyline
Keep reading about Carisoprodol
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