Drug & supplement interaction

Catechu + Paracetamol

Paracetamol brand name: Panadol.

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

Catechu has a moderate interaction with Paracetamol. Theoretically, black catechu may increase the levels and clinical effects of CYP1A2 substrates.

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

Catechu and Paracetamol

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

Moderate

CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES

Why this applies to Paracetamol

Paracetamol falls under CYTOCHROME P450 1A2 (CYP1A2) SUBSTRATES — the group Catechu interacts with.

Theoretically, black catechu may increase the levels and clinical effects of CYP1A2 substrates.
Animal research shows that black catechu can increase theophylline concentrations in the blood, possibly by inhibiting CYP1A2. Theophylline is a CYP1A2 substrate.
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 gist: catechu is rich in tannins that, in lab and animal studies, seemed to slow down a liver enzyme called CYP1A2. Since your body uses that same enzyme as one route to process paracetamol (Panadol), the theory is that catechu could cause a bit more paracetamol to linger in your system. Paracetamol is not a prodrug, so this would mean slightly stronger or longer-lasting effects rather than weaker ones.

But please don't lose sleep over this. This concern comes only from animal and test-tube research, not real people, so it's quite theoretical. Occasional, sensible paracetamol use is unlikely to be a problem. The bigger thing to remember is to never exceed the recommended paracetamol dose, since liver strain is the real risk. If you use catechu supplements regularly, just run it by your pharmacist or doctor.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Al-Mohizea AM, Raish M, Ahad A, et al. Pharmacokinetic interaction of Acacia catechu with CYP1A substrate theophylline in rabbits. J Tradit Chin Med 2015;35(5):588-93. PubMed

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

Catechu Also Interacts With Other Medications

Catechu has 474 moderate known drug interactions in our database — the Paracetamol one above is one of them. If you take anything else, check it against the full list below.

Moderate 474 No known interaction 2,356 (incl. Paracetamol)
Taking anything else?

Check Another of Your Medications Against Catechu

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

From our Q&A

Questions About Catechu or Paracetamol

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Catechu or Paracetamol, 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 Paracetamol

This page covers Catechu only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Paracetamol page lists 155 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Asarabacca (major), Beer (major), Siberian Cocklebur (major) and Wine (major).

By severity: 5 major · 114 moderate · 36 minor.

From our pharmacist’s overview on the Paracetamol page

“Nothing on this list concerns me more than alcohol for people who take paracetamol (Panadol) regularly. Beer and wine both carry major ratings because paracetamol is processed by the liver, and drinking on top of it raises the odds of genuine liver injury.”

Reviewed by 2 · Jul 18, 2026

Open the Paracetamol interaction page

One more smart check

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

We hold 122 real supplement products containing Catechu, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Catechu. Your product may carry other ingredients that interact with Paracetamol too, on top of Catechu — 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 Catechu and Paracetamol 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 Catechu
Top half

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

29 days ago today
Medication Paracetamol
Top 10%

#219 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 Catechu

What is Catechu?

Catechu
  • Mouth and throat soreness
  • Diarrhea and digestive upset
  • Skin wounds and bleeding gums
  • Astringent gargles and rinses
  • Traditional remedy for inflammation

Catechu is an astringent extract made from the heartwood of the Acacia (Senegalia) catechu tree, used traditionally for mouth sores, sore throat, diarrhea, and minor skin problems. Strong human evidence is lacking for most uses, so it should be viewed as a traditional remedy rather than a proven treatment. Talk to your pharmacist or doctor before using it, especially if you are pregnant, breastfeeding, or taking other medicines.

Read the full Catechu monograph & all interactions
Medication

About Acetaminophen Injection

What Is Acetaminophen Injection Used For?

Brand name: Panadol

Acetaminophen Injection is given intravenously (through a vein) to manage mild to moderate pain, or moderate to severe pain when used together with opioid pain medicines, in adults and children 2 years and older. It is also used to reduce fever in adults and pediatric patients of all ages, including premature newborns born at 32 weeks gestational age or later.

For children under 2 years old, Acetaminophen Injection is approved for fever reduction, but its effectiveness for pain relief in that age group has not been established.

See full Acetaminophen Injection drug information
Keep checking

Other Drugs & Catechu

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

0Major
474Moderate
0Minor
2,355No known interaction
474 Moderate 2,355 No interaction
Moderate

474 interactions

Showing 60 of 474 moderate interactions — see all 474 on the Catechu page.

No interaction 2,355 drugs checked — show the list

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

Showing the 60 most looked-up of 2,355 medications checked with no known interaction — see the full Catechu list.

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

Can you take Catechu with Paracetamol?
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 Catechu and Paracetamol 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 Paracetamol and Catechu?

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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.