Drug & supplement interaction

Scarlet Pimpernel + Guaifenesin

Guaifenesin brand names: Robitussin, Humibid LA, Amibid LA, Numobid, Muco-Fen 800, and others.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Scarlet Pimpernel and Guaifenesin in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

Know someone taking this? Share
Facebook Post Reddit Email
On this page
Interaction report

Scarlet Pimpernel and Guaifenesin

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Guaifenesin and Scarlet Pimpernel in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

Worth understanding: our licensed dataset holds no drug-interaction record for Scarlet Pimpernel at all — not against Guaifenesin, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Scarlet Pimpernel safety at a glance

Scarlet Pimpernel overall Use caution It contains potentially toxic compounds and is not well studied, so internal use is generally discouraged.
Pregnancy Likely Unsafe When used orally or topically long-term. Scarlet pimpernel shows evidence of uterine stimulant activity. Read the full pregnancy detail
Breastfeeding Possibly Unsafe When used orally or topically long-term; avoid using. Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Guaifenesin and Scarlet Pimpernel? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
Special populations

Scarlet Pimpernel in Pregnancy & Breastfeeding

Pregnancy Likely Unsafe

When used orally or topically long-term. Scarlet pimpernel shows evidence of uterine stimulant activity.

Lactation Possibly Unsafe

When used orally or topically long-term; avoid using.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

From our Q&A

Questions About Scarlet Pimpernel or Guaifenesin

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Scarlet Pimpernel or Guaifenesin, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Guaifenesin

This page covers Scarlet Pimpernel only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Guaifenesin page lists 26 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), Berberine (moderate), Bitter Orange (moderate) and Coffee Charcoal (moderate).

By severity: 2 major · 15 moderate · 9 minor.

From our pharmacist’s overview on the Guaifenesin page

“Guaifenesin (Robitussin, Humibid LA) loosens chest mucus, and by itself it is a mild medicine, but two of the 26 supplements on this list rate major, so those two deserve your attention first. Activated charcoal can bind the drug in your gut and blunt what it does, and grapefruit raises blood levels of dextromethorphan, the cough suppr…”

Reviewed by 2 · Jul 18, 2026

Open the Guaifenesin interaction page

How much people look this up

Where Scarlet Pimpernel and Guaifenesin 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 Scarlet Pimpernel
Steady interest

#1,296 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Guaifenesin
Top 10%

#171 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.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Scarlet Pimpernel reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Scarlet Pimpernel and Guaifenesin records this page draws on were last updated July 11, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Scarlet Pimpernel

What is Scarlet Pimpernel?

  • Skin conditions and wounds
  • Liver and gallbladder complaints
  • Respiratory ailments
  • Mild mood or 'melancholy' (folk use)
  • Urinary complaints

Scarlet Pimpernel is a small wild flowering plant with a long history in folk medicine, but there is very little modern scientific evidence to support any of its uses. It contains compounds called saponins that can be irritating and potentially toxic, so it is generally not recommended for internal use. If you are considering it, talk with a pharmacist or doctor first.

Lysimachia arvensis · Primulaceae · Aerial parts (leaves, flowers, and stems) · Dried herb, tinctures, infusions, and topical preparations

An interaction check asks whether these two react with each other — it does not ask whether Scarlet Pimpernel is a good idea for someone in your situation. Here is what our Scarlet Pimpernel record says about it on its own.

Scarlet Pimpernel: dosing

There is no established, standardized safe dose for Scarlet Pimpernel. Because of its potential toxicity and the lack of quality research, no specific milligram amount can be recommended.If you find a commercial product, follow the label directions exactly and do not exceed them.

From our Scarlet Pimpernel monograph — the full record covers uses, side effects and every documented interaction.

Read the full Scarlet Pimpernel monograph & all interactions
Medication

About Guaifenesin

What Is Guaifenesin Used For?

Brand names: Robitussin, Humibid LA, Amibid LA, Numobid, Muco-Fen 800, Bidex, Organidin, X-pect, Mucinex

Guaifenesin helps loosen phlegm (mucus) and thin bronchial secretions — the sticky fluid in your airways — so your cough can clear it out more effectively. It is used to relieve chest congestion associated with colds, respiratory infections, and other conditions that cause a mucus-filled cough.

This use is supported across multiple products including tablets, extended-release tablets, and oral solutions such as Childrens Mucus Relief, Tussin, Guaifenesin STRAWBERRY-BANANA FLAVOR, 12 Hour Mucus Relief, 365 Whole Foods Market Guaifenesin, Dr. Simi Mucus Relief, and others.

See full Guaifenesin drug information
Keep checking

Other Drugs & Scarlet Pimpernel

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

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

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

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Scarlet Pimpernel list.

See the full Scarlet Pimpernel interactions page
See every supplement checked against Guaifenesin, ranked by severity
Evidence & sources

Scarlet Pimpernel References

The 1 references that drive our Scarlet Pimpernel monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Scarlet Pimpernel and Guaifenesin Together: Common Questions

Is it safe to take Scarlet Pimpernel with Guaifenesin?
We do not list a known interaction between Scarlet Pimpernel and Guaifenesin. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Does Guaifenesin interact with any supplements?
Yes. Guaifenesin has documented interactions with 26 supplements in our database — Scarlet Pimpernel is not one of them. The Guaifenesin interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Scarlet Pimpernel monograph Uses, safety profile, and every drug interaction in one place Guaifenesin drug information The full plain-English guide to this medication Guaifenesin supplement interactions Every supplement checked against Guaifenesin, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Guaifenesin and Scarlet Pimpernel?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.