Drug & supplement interaction

Purple Nut Sedge + Guaifenesin, Phenylephrine

Guaifenesin, Phenylephrine brand names: Amidal, Endal, Numonyl Sr, Liquibid-D, Deconsal Sprinkle, 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 Purple Nut Sedge and Guaifenesin, Phenylephrine 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.

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Interaction report

Purple Nut Sedge and Guaifenesin, Phenylephrine

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, Phenylephrine and Purple Nut Sedge 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.

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.

Purple Nut Sedge safety at a glance

Purple Nut Sedge overall Use caution Traditional use is long, but high-quality human safety data are lacking.
Pregnancy Avoid Traditionally used to affect menstruation, so avoid during pregnancy.
Breastfeeding Avoid There is not enough safety information, so it is best avoided.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Guaifenesin, Phenylephrine and Purple Nut Sedge? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Guaifenesin, Phenylephrine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Guaifenesin, Phenylephrine is filed under 3 classifications — alpha-adrenergic agonists, stimulant drugs, oral drugs. Purple Nut Sedge has documented interactions with 4 drug classes — the most serious being anticholinergic drugs (moderate), anticoagulant/antiplatelet drugs (moderate) and antidiabetes drugs (moderate) — and none of Guaifenesin, Phenylephrine’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Purple Nut Sedge Does Interact With Other Medications

Purple Nut Sedge has 424 moderate known drug interactions in our database — Guaifenesin, Phenylephrine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 424 No known interaction 2,406 (incl. Guaifenesin, Phenylephrine)
Taking anything else?

Check Another of Your Medications Against Purple Nut Sedge

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

Everything else you take

See Every Supplement That Interacts With Guaifenesin, Phenylephrine

This page covers Purple Nut Sedge only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Guaifenesin, Phenylephrine page lists 62 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Ephedra (major), Peyote (major), Rauvolfia Vomitoria (major) and Sida Cordifolia (major).

By severity: 5 major · 44 moderate · 13 minor.

From our pharmacist’s overview on the Guaifenesin, Phenylephrine page

“Phenylephrine, the decongestant half of guaifenesin and phenylephrine (Endal, Liquibid-D, Deconsal), tightens blood vessels and raises blood pressure and heart rate, so this list of 62 interacting supplements calls for genuine care. Forty-four of them can pile extra stimulation on top of the drug's own effect, and five rate major, most…”

Reviewed by 2 · Jul 18, 2026

Open the Guaifenesin, Phenylephrine interaction page

How much people look this up

Where Purple Nut Sedge and Guaifenesin, Phenylephrine 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 Purple Nut Sedge
Top half

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

29 days ago today
Medication Guaifenesin, Phenylephrine
Steady interest

#1,571 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 Purple Nut Sedge reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Purple Nut Sedge and Guaifenesin, Phenylephrine records this page draws on were last updated July 10, 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 Purple Nut Sedge

What is Purple Nut Sedge?

  • Digestive upset and bloating
  • Menstrual cramps and irregular periods
  • Fever and inflammation
  • Skin and weight-related concerns
  • Antimicrobial uses

Purple nut sedge (Cyperus rotundus) is a common weed whose tubers have a long history in Ayurvedic, Chinese, and other traditional medicine systems, mostly for digestive and menstrual complaints. Modern human evidence is very limited, so its benefits remain unproven. If you want to try it, talk with a pharmacist or doctor first, and avoid it during pregnancy and breastfeeding.

Cyperus rotundus · Cyperaceae · Tubers (rhizomes) and essential oil · Powder, capsules, decoction (tea), essential oil, traditional herbal formulas

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

Purple Nut Sedge: dosing

There is no well-established or standardized dose for purple nut sedge. Traditional preparations vary widely, and the strength of capsules, powders, and oils differs from product to product.If you choose to use it, follow the directions on the product label and start low. A pharmacist can help you review the product and decide whether it is appropriate for you. Do not use the essential oil internally unless directed by a qualified professional.

From our Purple Nut Sedge monograph — the full record covers uses, side effects and every documented interaction.

Read the full Purple Nut Sedge monograph & all interactions
Keep checking

Other Drugs & Purple Nut Sedge

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

0Major
424Moderate
0Minor
2,405No known interaction
424 Moderate 2,405 No interaction
Moderate

424 interactions

Showing 60 of 424 moderate interactions — see all 424 on the Purple Nut Sedge page.

No interaction 2,405 drugs checked — show the list

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

Showing the 60 most looked-up of 2,405 medications checked with no known interaction — see the full Purple Nut Sedge list.

See the full Purple Nut Sedge interactions page
See every supplement checked against Guaifenesin, Phenylephrine, ranked by severity
Evidence & sources

Purple Nut Sedge References

The 5 references that drive our Purple Nut Sedge 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. Seo EJ, Lee DU, Kwak JH, et al. Antiplatelet effects of Cyperus rotundus and its component (+)-nootkatone. J Ethnopharmacol. 2011;135(1):48-54. PubMed
  2. Raut NA, Gaikwad NJ. Antidiabetic activity of hydro-ethanolic extract of Cyperus rotundus in alloxan induced diabetes in rats. Fitoterapia. 2006;77(7-8):585-588. PubMed
  3. Sharma R, Gupta R. Cyperus rotundus extract inhibits acetylcholinesterase activity from animal and plants as well as inhibits germination and seedling growth in wheat and tomato. Life Sci. 2007;80(24-25):2389-2392. PubMed
  4. Sahib AS. Treatment of irritable bowel syndrome using a selected herbal combination of Iraqi folk medicines. J Ethnopharmacol 2013;148(3):1008-12. PubMed
  5. Mohammed GF. Topical Cyperus rotundus oil: a new therapeutic modality with comparable efficacy to Alexandrite laser photo-epilation. Aesthet Surg J. 2014;34(2):298-305. PubMed

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 Purple Nut Sedge and Guaifenesin, Phenylephrine Together: Common Questions

Is it safe to take Purple Nut Sedge with Guaifenesin, Phenylephrine?
We do not list a known interaction between Purple Nut Sedge and Guaifenesin, Phenylephrine. 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.
How was the Purple Nut Sedge and Guaifenesin, Phenylephrine combination checked?
Interactions in our licensed database are recorded against drug classes. Guaifenesin, Phenylephrine is filed under 3 classifications, and Purple Nut Sedge has documented interactions with 4 drug classes — none of Guaifenesin, Phenylephrine's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Purple Nut Sedge interact with any other medications?
Yes. Purple Nut Sedge has 424 documented drug interactions in our database — Guaifenesin, Phenylephrine is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Guaifenesin, Phenylephrine interact with any supplements?
Yes. Guaifenesin, Phenylephrine has documented interactions with 62 supplements in our database — Purple Nut Sedge is not one of them. The Guaifenesin, Phenylephrine 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

Purple Nut Sedge monograph Uses, safety profile, and every drug interaction in one place Guaifenesin, Phenylephrine supplement interactions Every supplement checked against Guaifenesin, Phenylephrine, 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 5 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Guaifenesin, Phenylephrine and Purple Nut Sedge?

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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.