Herb & supplement monograph

Carqueja Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated June 2026

What is this page for?

First and foremost: how Carqueja interacts with medications. The heart of this page is the interaction list — every drug Carqueja is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Carqueja is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Carqueja Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Carqueja drug interaction appears low for most people. None of the listed interactions are rated major, and every one traces back to a single theoretical concern rather than documented problems in people.

Interactions deserving the most attention

The interactions that matter most involve diabetes medications, including insulin, metformin, glyburide, and similar drugs. Carqueja may lower blood sugar on its own, so combining it with these medicines could theoretically drop blood sugar too far in some people. Because blood sugar is a closely watched target, anyone taking these medicines should keep a closer eye on their readings while using this herb. That said, this concern comes from early laboratory-style research, not from confirmed reports in people.

What the rest of the list means

Although the list of interacting medications looks long, nearly all of it reflects that one possible blood sugar effect applied across the many drugs used to treat diabetes. A long list does not mean each combination is harmful, and no interaction here has been proven to cause meaningful changes in people. For those not taking blood sugar medicines, the data points to little cause for concern.

Check your medications against Carqueja

Based on HelloPharmacist’s Carqueja interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Carqueja

86 medications have a known interaction with Carqueja, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Carqueja using our pharmacist-reviewed interaction data.

AI summaries are generated from our Carqueja interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. 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.
Possible. 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
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Carqueja combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Carqueja affects

Every type of medication (drug category) Carqueja is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Carqueja interacts with

Antidiabetes Drugs

Theoretically, carqueja might lower blood glucose levels and might have additive effects when used with antidiabetes drugs. This might increase the risk of hypoglycemia in some patients. Monitor blood glucose levels closely. Some antidiabetes drugs include glimepiride (Amaryl), glyburide (DiaBeta, Glynase PresTab, Micronase), insulin, metformin (Glucophage), pioglitazone (Actos), rosiglitazone (Avandia), and others.

Likelihood Possible Evidence D

Monograph

Carqueja: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed June 2026 ·

The bottom line

Carqueja is a South American herb traditionally used as a bitter tea for digestion, liver complaints, and blood sugar. Human evidence is very limited, so its benefits are not well proven. Because safety data are thin, it should be avoided in pregnancy and breastfeeding and used cautiously by everyone else.

Scientific name: Baccharis trimera
Family: Asteraceae
Part used: Aerial parts (stems and winged branches)
Common forms: Tea (infusion or decoction), tincture, capsules, liquid extract

People commonly use it for

Digestive upset and bloating
Liver and gallbladder support
Blood sugar control
Weight loss
Anti-inflammatory

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Limited human safety data; use cautiously and discuss with a healthcare professional.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Carqueja is a bitter-tasting herb that grows in South America, especially Brazil, Argentina, Paraguay, and Uruguay. The plant is best known by its botanical name Baccharis trimera and belongs to the daisy (Asteraceae) family. It has flattened, winged green stems that do most of the plant's photosynthesis, since the leaves are very small.

People have used carqueja in traditional folk medicine for a long time, most often as a tea brewed from the dried aerial parts. It is also sold as capsules, tinctures, and liquid extracts. Because of its strong bitter flavor, it is mainly taken for digestive and liver-related complaints.

How it works

Carqueja contains a mix of natural plant compounds, including flavonoids, diterpenes (such as those linked to its bitter taste), and other antioxidant substances. In laboratory and animal research, these compounds have shown antioxidant and anti-inflammatory activity, and some studies suggest they may affect how the body handles sugar and fats.

The bitter compounds may also stimulate digestive juices, which is part of why it is traditionally taken before or after meals. Keep in mind that these proposed mechanisms are mostly based on test-tube and animal studies, and may not translate the same way to the human body.

Effectiveness

Does Carqueja work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 8 uses evaluated

8 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

For Carqueja, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 8 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Diabetes