Drug & supplement interaction

Arrach + Prochlorperazine

Prochlorperazine brand names: Prochlor, Compazine.

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

Arrach has a moderate interaction with Prochlorperazine. Theoretically, concomitant use of arrach can increase risk of adverse effects, as unspecified Chenopodium species are associated with photosensitivity.

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

Arrach and Prochlorperazine

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

Moderate

PHOTOSENSITIZING DRUGS

Why this applies to Prochlorperazine

Prochlorperazine falls under PHOTOSENSITIZING DRUGS — the group Arrach interacts with.

Theoretically, concomitant use of arrach can increase risk of adverse effects, as unspecified Chenopodium species are associated with photosensitivity.
Severity Moderate Likelihood Possible Evidence D

Interaction 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.

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

Here's the short version: this isn't about how your body breaks down prochlorperazine. Instead, both prochlorperazine and the herb arrach can separately make your skin more sensitive to sunlight. Prochlorperazine is already known to cause photosensitivity, meaning you can sunburn faster or develop a rash with less sun than usual. Some goosefoot-family plants like arrach may do the same thing, so stacking them together could, in theory, add up.

Keep in mind this is a theoretical concern based on plant chemistry, not strong human studies. Still, it's easy to play it safe with sunscreen, a hat, and shade. If you're considering arrach, please check with your pharmacist or doctor first, since the herb itself isn't well studied.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 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

Arrach Also Interacts With Other Medications

Arrach has 334 moderate known drug interactions in our database — the Prochlorperazine one above is one of them. If you take anything else, check it against the full list below.

Moderate 334 No known interaction 2,496 (incl. Prochlorperazine)
Taking anything else?

Check Another of Your Medications Against Arrach

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

Everything else you take

See Every Supplement That Interacts With Prochlorperazine

This page covers Arrach only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Prochlorperazine page lists 96 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Henbane (major), Indian Snakeroot (major), Rauvolfia Vomitoria (major) and Scopolia (major).

By severity: 5 major · 67 moderate · 24 minor.

Open the Prochlorperazine interaction page

How much people look this up

Where Arrach and Prochlorperazine 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 Arrach
Steady interest

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

29 days ago today
Medication Prochlorperazine
Steady interest

#2,186 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 Arrach

What is Arrach?

Arrach
  • Painful menstruation
  • Nervous complaints
  • Digestive upset
  • Wound care
  • Insect repellent

Arrach (Chenopodium vulvaria) is a strong-smelling European herb that has been used in traditional folk medicine, mainly for menstrual and nervous complaints. There is very little modern scientific evidence to show that it works or is safe, so it is not recommended, especially during pregnancy or breastfeeding. Talk to your pharmacist or doctor before using any herbal product.

Read the full Arrach monograph & all interactions
Medication

About Prochlorperazine

What Is Prochlorperazine Used For?

Brand names: Prochlor, Compazine

Prochlorperazine is used across several forms and products to control severe nausea and vomiting in adults. It is also used to treat schizophrenia. Prochlorperazine tablets (Prochlorperazine, Prochlorperazine Maleate) are additionally approved for the short-term treatment of generalized non-psychotic anxiety — though they are not the first-choice treatment for anxiety, given their risk profile.

Compro rectal suppositories and Prochlorperazine rectal suppositories are specifically indicated for controlling severe nausea and vomiting in adults. Prochlorperazine Edisylate injection is approved for severe nausea and vomiting and for schizophrenia, but it is not approved for dementia-related psychosis.

See full Prochlorperazine drug information
Keep checking

Other Drugs & Arrach

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

0Major
334Moderate
0Minor
2,495No known interaction
334 Moderate 2,495 No interaction
Moderate

334 interactions

Showing 60 of 334 moderate interactions — see all 334 on the Arrach page.

No interaction 2,495 drugs checked — show the list

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

Showing the 60 most looked-up of 2,495 medications checked with no known interaction — see the full Arrach list.

See the full Arrach interactions page
See every supplement checked against Prochlorperazine, 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
Arrach monograph › Uses, safety, and every drug interaction in one place Prochlorperazine supplement interactions › Every supplement checked against Prochlorperazine, ranked by severity Prochlorperazine 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 Arrach and Prochlorperazine Together: Common Questions

Can you take Arrach with Prochlorperazine?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Arrach and Prochlorperazine interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Prochlorperazine and Arrach?

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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.