How does Phellodendron bark work medicinally?

Phellodendron bark works primarily through its isoquinoline alkaloids, specifically berberine, palmatine, and coptisine. These compounds exert antimicrobial and anti-inflammatory effects by inhibiting bacterial enzymes and modulating inflammatory pathways like NF-kappaB. In Traditional Chinese Medicine (TCM) theory, it drains 'kidney fire' and dries dampness, which correlates with its modern use in treating urinary tract infections and inflammatory conditions. Evidence Level: C/Traditional.

Does Phellodendron bark interact with prescription medications?

Yes, Phellodendron bark can interact with medications due to its berberine content. Berberine inhibits cytochrome P450 enzymes (specifically CYP2D6 and CYP3A4) and P-glycoprotein, potentially increasing blood levels of drugs metabolized by these pathways. It may also enhance the effects of antidiabetic drugs and anticoagulants, increasing the risk of hypoglycemia or bleeding. Patients taking prescription medications should consult a healthcare provider before use. Evidence Level: C.

What is the standard dosage for Phellodendron bark?

The standard adult dosage for Phellodendron bark is 3 to 12 grams of dried bark daily, typically prepared as a decoction. For standardized extracts, a dosage of 300 to 500 mg of berberine equivalent per day is common. Because the herb is potent and cold in nature, it should be taken under the guidance of a qualified practitioner to determine the appropriate duration and amount for specific conditions. Evidence Level: Traditional.

Is Phellodendron bark safe to take during pregnancy?

No, Phellodendron bark is considered unsafe during pregnancy. The herb contains berberine, which stimulates uterine contractions and may cross the placenta, potentially causing harm to the fetus or inducing premature labor. Historical texts and modern safety assessments contraindicate its use for pregnant women. Women who are breastfeeding should also avoid this herb due to insufficient safety data. Evidence Level: C.

Who should not take Phellodendron bark?

Phellodendron bark is contraindicated for individuals with a 'cold' constitution, digestive weakness, or spleen deficiency, as its cold and bitter properties can exacerbate symptoms like diarrhea, poor appetite, and cold extremities. It is also unsuitable for pregnant women. Patients with chronic gastrointestinal conditions should use caution, as the herb can cause nausea and stomach upset in sensitive individuals. Evidence Level: Traditional.

Phellodendron Bark (Phellodendron chinense)

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Phellodendron Bark (Phellodendron chinense), known in TCM as Huang Bai or Huang Bo, is a medicinal herb used for its anti-inflammatory, antimicrobial, and therapeutic effects [PMID:31057654, PMID:38823658].

Background

Phellodendron chinense Schneid (PCS) is a medicinal plant from the Rutaceae family, primarily utilized for its dried trunk bark [PMID:31057654, PMID:33367103].

Traditional uses

Traditionally used in TCM to remove damp heat, relieve consumptive fever, cure dysentery and diarrhea [PMID:28574473], support gastrointestinal function, and alleviate stomach-related ailments such as gastric ulcer bleeding and gastroesophageal reflux disease [PMID:38823658]. It is also used in traditional Mongolian medicine (Xieriga-4 Decoction) for urinary system diseases including frequent urination, urgent urination, hematuria, and bladder pain [PMID:36118011].

Active compounds

Key bioactive compounds include isoquinoline alkaloids such as berberine [PMID:31057654, PMID:36105164], phellodendrine [PMID:28574473, PMID:37488762], jatrorrhizine [PMID:33822109], and palmatine [PMID:31685744]. Other identified constituents include limonin [PMID:31614806], obacunone [PMID:41611132], 4,8-dimethoxy-furo[2,3-b]quinoline (γ-fagarine) [PMID:22090957], and an arabinogalactan named PPCP-1 [PMID:34364577].

Mechanism of action

Mechanisms vary by compound: phellodendrine chloride may alleviate gouty arthritis via the IL-6/STAT3 signaling pathway [PMID:40472707]; obacunone may mitigate cisplatin-induced ototoxicity by upregulating CRHBP to activate autophagy and inhibit apoptosis [PMID:41611132]; and berberine may exert antidepressant effects by modulating the gut microbial community, strengthening the intestinal barrier, and regulating tryptophan metabolism [PMID:40107207].

Clinical evidence

Evidence DGouty Arthritis

Phellodendrine chloride demonstrated therapeutic potential in rat models by inhibiting the cellular immune response and reducing proteoglycan depletion [PMID:40472707]

Evidence DDiabetic Osteoporosis

The isolated arabinogalactan PPCP-1 preserved bone health by inhibiting α-glucosidase activity and improving glucose tolerance [PMID:34364577]

Evidence DPostmenopausal Osteoporosis

A herb pair of Anemarrhena asphodeloides and Phellodendron chinense increased bone mineral density and inhibited the bone resorption marker NFAT1 in OVX mice [PMID:39512823]

Evidence DDental Decay (S. mutans)

Phellodendron bark extract suppressed the growth and biofilm formation of Streptococcus mutans in a dose-dependent manner [PMID:32196736]

Evidence DUlcerative Colitis

Baitouweng decoction (containing P. chinense) alleviated colitis in DSS-induced mice by regulating tryptophan metabolism [PMID:38974042]

Safety & adverse effects

Limonin, found in P. chinense, has been associated with hepatotoxicity, renal toxicity, and genetic damage [PMID:31614806].

Evidence summary

The current evidence is primarily based on in vitro studies, animal models (mice/rats), and pharmacological reviews; there is a lack of high-level human clinical trial data (RCTs or meta-analyses) in the provided set.

PubMed sources

1.PMID: 22090957 (2011) — 4,8-Dimeth-oxy-furo[2,3-b]quinoline (γ-fagarine). · Acta crystallographica. Section E, Structure reports online
2.PMID: 31057654 (2019) — Phellodendri Cortex: A Phytochemical, Pharmacological, and Pharmacokinetic Review. · Evidence-based complementary and alternative medicine : eCAM
3.PMID: 38823658 (2024) — Phellodendron chinense C.K.Schneid: An in vitro study on its anti-Helicobacter pylori effect. · Journal of ethnopharmacology
4.PMID: 40751788 (2025) — Metabolism of coclaurine into the WADA-banned substance higenamine: a doping-relevant analytical evaluation of Kampo extracts. · Journal of natural medicines
5.PMID: 38974042 (2024)

Phellodendron Bark

Sources & Citations