Belladonna and Amitriptyline: 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
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 what pharmacists call anticholinergic effects. Amitriptyline (Elavil) already tends to cause dry mouth, constipation, trouble urinating, blurry vision, and drowsiness. Belladonna contains natural compounds (atropine, scopolamine, hyoscyamine) that do the same kinds of things. Taken together, those effects can add up and feel stronger.
The good news is that this concern is mostly theoretical, and belladonna is usually sold in very diluted homeopathic products, so the real-world impact is uncertain. Still, it is worth mentioning both to your pharmacist or doctor. Please do not stop anything on your own. Your care team can watch for these side effects and adjust things if needed.
Mechanism: additive anticholinergic effect. Amitriptyline is a tertiary-amine TCA with significant intrinsic muscarinic antagonism; belladonna alkaloids (L-hyoscyamine, atropine, scopolamine) add further antimuscarinic load. Neither is a relevant prodrug here, so the effect is pharmacodynamic additivity, not altered clearance.
Direction: increased anticholinergic burden (dry mouth, constipation, urinary retention, blurred vision, sedation, tachycardia, possible delirium in the elderly).
- Onset: rapid
- Evidence: theoretical; belladonna typically homeopathic, so clinical magnitude uncertain
- Management: use caution, monitor for anticholinergic symptoms, review OTC/herbal use, consider avoiding belladonna-containing products in elderly or at-risk patients
What happens
Excessive anticholinergic activity (severe dry mouth, constipation, decreased urination, excessive sedation, blurred vision)
Interaction Deep Dive
Use belladonna together with tricyclic antidepressants only with caution. The active alkaloids in belladonna have anticholinergic properties, and combining them with tricyclic antidepressants may leave the patient vulnerable to an overabundance of anticholinergic activity. The alkaloids found in belladonna include L-hyoscyamine, atropine, and scopolamine, with the total alkaloid content reaching at least 0.3% in the leaves and 0.5% in the roots. Since belladonna is usually supplied as a homeopathic preparation, the clinical severity of its interaction with tricyclic antidepressants has not been established1.
Why it happens (mechanism)
Additive anticholinergic effect
How to manage this interaction
These two overlap because they both have anticholinergic (drying) effects, so together they can intensify symptoms like dry mouth, constipation, difficulty urinating, blurred vision, and drowsiness.
- Keep taking your amitriptyline as prescribed unless your doctor tells you otherwise.
- Tell your pharmacist or prescriber if you use any belladonna-containing product, including homeopathic remedies.
- Watch for worsening dry mouth, constipation, trouble urinating, blurry vision, or feeling overly sedated, and report these.
- Your care team may monitor you more closely or suggest an alternative product if symptoms appear.
Because belladonna is usually very diluted, the actual effect is often uncertain, but it is still worth flagging.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Belladonna and Amitriptyline together?
Combining belladonna with amitriptyline can add up their drying (anticholinergic) side effects, though the real-world impact is uncertain since belladonna is usually a diluted homeopathic product. Let your pharmacist or doctor know you use both and watch for symptoms like dry mouth, constipation, or trouble urinating. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Belladonna and Amitriptyline 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 Belladonna and Amitriptyline interaction managed?
These two overlap because they both have anticholinergic (drying) effects, so together they can intensify symptoms like dry mouth, constipation, difficulty urinating, blurred vision, and drowsiness. Keep taking your amitriptyline as prescribed unless your doctor tells you otherwise. Tell your pharmacist or prescriber if you use any belladonna-containing product, including homeopathic remedies. Wat… 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 Belladonna or Amitriptyline 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
Keep reading about Belladonna
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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