Cascarilla Drug Interactions, Uses, Safety & More
What is this page for?
First and foremost: how Cascarilla interacts with medications. The heart of this page is the interaction list — every drug Cascarilla is known to interact with, and how serious each one is.
But these pages have grown well beyond that into a full monograph — what Cascarilla 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
Check Cascarilla against your medication
Add one medicationDrugs that interact with Cascarilla
0 medications have a known interaction with Cascarilla, graded by severity. Select any drug for the full evidence-based detail.
We don’t currently list any known drug interactions for Cascarilla. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.
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 Cascarilla combination — clinical detail, likelihood, evidence level, and citations.
- Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Cascarilla: Uses, Safety & Side Effects
Cascarilla is the aromatic, bitter bark of a Caribbean shrub (Croton eluteria) that has long been used as a digestive bitter and a flavoring. Modern scientific evidence for any health benefit is very limited, so it should be viewed as a traditional remedy rather than a proven treatment. Talk with your pharmacist or doctor before using it, and avoid it during pregnancy and breastfeeding.
- Scientific name
- Croton eluteria
- Family
- Euphorbiaceae
- Part used
- Dried bark (and an essential oil distilled from it)
- Common forms
- Tincture, bitters, tea, essential oil, and a flavoring in some liqueurs and tobacco products
- Digestive upset and poor appetite
- Bitter tonic for the stomach
- Mild fever or chills (traditional)
- Flavoring agent
- Aromatic/incense use
Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.
Limited safety data exist, so use modest amounts and discuss with a healthcare professional first.
Insufficient reliable information available; avoid using.
Read the full pregnancy detailInsufficient reliable information available; avoid using.
Read the full breastfeeding detailPregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
Overview
Cascarilla is the dried bark of Croton eluteria, a small shrub or tree in the spurge family (Euphorbiaceae). It grows in the Caribbean, especially in the Bahamas, and on nearby islands. The bark has a warm, spicy, slightly bitter aroma when burned or steeped.
People have used cascarilla for centuries as a bitter tonic to support digestion and appetite. It is also used as a flavoring in some alcoholic drinks (such as certain bitters and aromatized wines), in incense, and historically as a flavor additive in some tobacco products.
Today it is most often found as a tincture, in herbal bitters blends, as a tea, or as an essential oil. It is more of a traditional and culinary ingredient than a mainstream medicinal supplement.
Uses & effectiveness
Cascarilla is traditionally used for digestive complaints, such as upset stomach, bloating, gas, and low appetite. Like many bitter herbs, it is taken before or after meals in small amounts. It has also been used in folk medicine for fevers and as a general tonic.
Despite this long history of use, high-quality human studies are lacking. There is not enough reliable clinical evidence to confirm that cascarilla effectively treats any specific health condition. Most of what is known comes from traditional use, laboratory testing of its chemical components, and its role as a flavoring agent.
Bottom line: consider cascarilla an unproven traditional remedy. If you have ongoing digestive problems or fever, see a healthcare professional rather than relying on cascarilla.
How it works
Cascarilla bark contains bitter compounds, aromatic essential oils, and resins, along with plant chemicals such as terpenes and small amounts of tannins. The bitterness is thought to be the main reason it has been used as a digestive aid.
Bitter-tasting herbs are traditionally believed to stimulate saliva and digestive juices, which may help with appetite and the feeling of digestion. This is a general idea about bitters and has not been specifically proven for cascarilla.
Any other proposed effects, such as antimicrobial activity, are based mainly on laboratory or test-tube research and have not been confirmed to work in people. The exact way cascarilla affects the body is not well understood.
Safety & precautions
Cascarilla has been used in food and drinks in small amounts for a long time, which suggests low-level culinary use is generally tolerated by most people. However, there is very little formal safety research, especially for concentrated supplements, tinctures, or the essential oil.
Essential oils are highly concentrated and should never be swallowed unless directed by a qualified professional. Concentrated plant extracts can be irritating and may be harmful in large amounts.
People with liver disease, kidney disease, or any chronic illness, as well as children and older adults, should be especially careful and talk with a pharmacist or doctor first. Pregnant and breastfeeding people should avoid cascarilla because its safety has not been established.
Side effects
Reliable information on side effects is limited. As with other bitter herbs and essential oils, possible effects include stomach upset, nausea, or mouth and throat irritation, especially with strong tinctures or undiluted oil.
Some people may have an allergic reaction to the plant. Stop use and seek medical care if you notice rash, swelling, trouble breathing, or other signs of a serious reaction.
Taking large amounts of any concentrated plant extract can be harmful. Use only small, label-recommended amounts.
Dosing
There is no well-established or standardized medicinal dose for cascarilla. Traditional use typically involves small amounts of bark steeped as a tea or a few drops of tincture used as a bitter.
Because product strengths vary widely, the safest approach is to follow the directions on the product label and not exceed them. Do not consume the essential oil internally unless specifically advised by a qualified healthcare professional.
Before starting cascarilla, check with your pharmacist or doctor, especially if you take other medicines or have a health condition.
Cascarilla & Pregnancy
Cascarilla & Breastfeeding
© 2026 Therapeutic Research Center
Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center
References & further reading
The 3 sources that drive our Cascarilla monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing.
- Croton eluteria (Cascarilla) — U.S. National Library of Medicine, PubChem Source
- Herbs at a Glance — NIH National Center for Complementary and Integrative Health Source
- Herbs and Supplements — MedlinePlus Source
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.
Cascarilla: Common Questions
Does Cascarilla interact with prescription medications?
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Where does this Cascarilla interaction information come from?
What is Cascarilla used for?
Is Cascarilla safe to take?
Can I use Cascarilla while pregnant or breastfeeding?
Can I swallow Cascarilla essential oil?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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