Amitriptyline and Belladonna Alkaloids: 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
Belladonna Alkaloids
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 of these can cause the same kinds of side effects, and taking them together can add up. Amitriptyline (Elavil) is a tricyclic antidepressant, and belladonna contains natural compounds (like atropine and scopolamine) that both have what we call anticholinergic activity. Stacked together, they can lead to a very dry mouth, constipation, trouble urinating, blurry vision, and feeling extra drowsy.
The good news is this is a theoretical concern, and belladonna is usually sold in very diluted homeopathic form, so the real-world effect is often small. Still, please let your pharmacist or doctor know you take both. They can watch for these symptoms and keep you comfortable.
Additive anticholinergic effect (PD interaction). Amitriptyline, a tricyclic, has intrinsic antimuscarinic activity; belladonna alkaloids (L-hyoscyamine, atropine, scopolamine) are direct muscarinic antagonists. Neither is a prodrug, so effects simply summate.
- Direction: increased anticholinergic burden (dry mouth, constipation, urinary retention, blurred vision, sedation, and risk of confusion/delirium in the elderly).
- Onset: rapid.
- Evidence: theoretical; belladonna commonly sold as homeopathic dilution, so clinical magnitude is uncertain.
- Management: use caution, monitor for anticholinergic toxicity, and individualize therapy; consider avoiding non-essential belladonna products.
What happens
Excessive anticholinergic activity (severe dry mouth, constipation, decreased urination, excessive sedation, blurred vision)
Interaction Deep Dive
Care should be taken when belladonna is used together with tricyclic antidepressants. The active alkaloids in belladonna have anticholinergic properties that may make a patient susceptible to excessive anticholinergic effects when combined with tricyclic antidepressants. The alkaloids found in belladonna include L-hyoscyamine, atropine, and scopolamine, and the total alkaloid concentration reaches at least 0.3% in the leaves and 0.5% in the roots. Since belladonna is generally supplied as a homeopathic preparation, the clinical severity of this interaction with tricyclic antidepressants remains unknown1.
Why it happens (mechanism)
Additive anticholinergic effect
How to manage this interaction
This is usually manageable. Keep taking your amitriptyline exactly as prescribed and do not stop it on your own.
- Tell your pharmacist or prescriber about any belladonna-containing or homeopathic product before you use it.
- Watch for signs of too much anticholinergic effect: severe dry mouth, constipation, trouble urinating, blurred vision, or unusual drowsiness or confusion.
- Your care team may monitor you more closely, or suggest avoiding the belladonna product if it is not essential.
- Report bothersome symptoms promptly so your team can adjust and individualize your plan.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Belladonna Alkaloids together?
Amitriptyline and belladonna both have anticholinergic effects that can add up, so watch for dry mouth, constipation, urinary trouble, blurred vision, or sedation, and tell your pharmacist or doctor you use both. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Belladonna Alkaloids interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
How is the Amitriptyline and Belladonna Alkaloids interaction managed?
This is usually manageable. Keep taking your amitriptyline exactly as prescribed and do not stop it on your own. Tell your pharmacist or prescriber about any belladonna-containing or homeopathic product before you use it. Watch for signs of too much anticholinergic effect: severe dry mouth, constipation, trouble urinating, blurred vision, or unusual drowsiness or confusion. Your care team may moni… 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 Belladonna Alkaloids 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)
- Blumenthal, M, Busse WR, et alBlumenthal, M, Busse WR, et al (Eds): The Complete German Commission E Monographs, 1st. American Botanical Council, Austin, TX, 1998, pp 87-88.
Keep reading about Amitriptyline
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