Drug & supplement interaction

Henbane + Disopyramide Phosphate

Disopyramide Phosphate brand names: Norpace CR, Norpace.

Major Interaction
Medically reviewed by · Updated September 2026
The bottom line Major

Henbane has a major interaction with Disopyramide Phosphate. Concomitant use of henbane can have additive anticholinergic effects and adverse effects with amantadine, antihistamines, atropine, belladonna alkaloids, hyoscyamine, phenothiazines, procainamide, scopolamine, and tricyclic antidepressants.

Read the full interaction report
SeverityMajor
LikelihoodProbable
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Henbane and Disopyramide Phosphate

Here is the interaction we found between these two, with the evidence behind it.

Major

ANTICHOLINERGIC DRUGS

Why this applies to Disopyramide Phosphate

Disopyramide Phosphate falls under ANTICHOLINERGIC DRUGS — the group Henbane interacts with.

Concomitant use of henbane can have additive anticholinergic effects and adverse effects with amantadine, antihistamines, atropine, belladonna alkaloids, hyoscyamine, phenothiazines, procainamide, scopolamine, and tricyclic antidepressants.
Severity Major Likelihood Probable Evidence D

Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports..

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here is the thing worth knowing: disopyramide already has fairly strong anticholinergic activity of its own. That means it can naturally cause dry mouth, blurry vision, constipation, trouble urinating, and a faster heartbeat. Henbane is loaded with the same kind of compounds (hyoscyamine, scopolamine, atropine), so putting the two together is like pressing on that same pedal twice. The effects can stack up.

This concern is based on how these substances work rather than on hard clinical studies, but it makes good sense pharmacologically, and disopyramide is a heart rhythm drug where I do not want to take chances. Henbane is genuinely toxic on its own, so I would not use it at all. Please check with your doctor or pharmacist before mixing anything new with this medication.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Henbane Also Interacts With Other Medications

Henbane has 194 major, known drug interactions in our database — the Disopyramide Phosphate one above is one of them. If you take anything else, check it against the full list below.

Major 194 No known interaction 2,636 (incl. Disopyramide Phosphate)
Taking anything else?

Check Another of Your Medications Against Henbane

Covers the 2,830 medications we’ve checked against Henbane. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Disopyramide Phosphate

This page covers Henbane only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Disopyramide Phosphate page lists 169 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), Arsenic (major), Cesium (major) and Ephedra (major).

By severity: 10 major · 117 moderate · 42 minor.

From our pharmacist’s overview on the Disopyramide Phosphate page

“Grapefruit is the first thing I would set aside on disopyramide phosphate (Norpace), a medicine that steadies dangerous heart rhythms, because grapefruit juice can push the drug's blood level up. That pattern dominates the page, since 121 of the 169 flagged ingredients act on the same liver enzyme, CYP3A4, raising the drug's level or,…”

Reviewed by 2 · Jul 18, 2026

Open the Disopyramide Phosphate interaction page

One more smart check

Taking Henbane as Part of a Dietary Supplement Product? Check It for Interactions

We hold 6 real supplement products containing Henbane, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Henbane. Your product may carry other ingredients that interact with Disopyramide Phosphate too, on top of Henbane — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Henbane and Disopyramide Phosphate Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Henbane
Steady interest

#899 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Disopyramide Phosphate
Steady interest

#1,797 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Supplement

About Henbane

What is Henbane?

Henbane
  • Pain relief
  • Muscle spasms and cramps
  • Sleep and sedation
  • Asthma and breathing problems (traditional)
  • Toothache (traditional)

Henbane is a highly poisonous plant containing potent alkaloids like hyoscyamine and scopolamine, and even small amounts can cause serious or deadly poisoning. While its compounds have real medical uses, these belong in carefully controlled prescription drugs, not in self-made or self-dosed herbal products. We strongly advise against using henbane as a supplement.

Read the full Henbane monograph & all interactions
Medication

About Disopyramide

What Is Disopyramide Used For?

Brand names: Norpace CR, Norpace

Disopyramide — available as Disopyramide Phosphate, Norpace, and Norpace CR — is indicated for the treatment of documented ventricular arrhythmias, such as sustained ventricular tachycardia (a fast, dangerous heart rhythm originating in the lower chambers), that a physician judges to be life-threatening.

Because of its potential to worsen heart rhythm problems, it is generally not recommended for lesser arrhythmias, and it should not be used to treat ventricular premature contractions (extra heartbeats) that cause no symptoms. Treatment is typically started in a hospital setting.

See full Disopyramide drug information
Keep checking

Other Drugs & Henbane

Browse every other medication we’ve checked against Henbane — both the ones with a known interaction and the ones without. Select any drug for the full detail.

194Major
0Moderate
0Minor
2,635No known interaction
194 Major 2,635 No interaction
Major

194 interactions

Showing 60 of 194 major interactions — see all 194 on the Henbane page.

No interaction 2,635 drugs checked — show the list

We also checked Henbane against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,635 medications checked with no known interaction — see the full Henbane list.

See the full Henbane interactions page
See every supplement checked against Disopyramide Phosphate, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Henbane monograph › Uses, safety, and every drug interaction in one place Disopyramide Phosphate supplement interactions › Every supplement checked against Disopyramide Phosphate, ranked by severity Disopyramide drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Henbane and Disopyramide Phosphate Together: Common Questions

Can you take Henbane with Disopyramide Phosphate?
This is rated a major interaction, so the combination is best avoided unless your doctor or pharmacist has specifically told you otherwise. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Henbane and Disopyramide Phosphate interaction?
We rate it Major. This is a clinically significant combination that is generally best avoided, or used only under the direct supervision of your physician or pharmacist.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Still Have a Question About Disopyramide Phosphate and Henbane?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.