Natural Herb Library

Prepared Licorice Root

Chinese
制甘草
Pinyin
Zhi Cao
Latin
Radix Glycyrrhizae Praeparata
Botanical illustration of Prepared Root of Ural Licorice, Glycyrrhiza uralensis, showing drier processed licorice root sections and diagnostic source details.
Botanical plate by Kodi .

Known in TCM as Zhi Cao (制甘草), this sweet, neutral herb enters the Heart, Lung, Spleen, and Stomach. Traditionally, it harmonizes formulas and moderates urgency ... this prepared licorice lane is used to ease abdominal spasm, coordinate stronger herbs, and soften harsh formula edges, most often applied for fatigue, cough, and abdominal pain. Modern research has identified Glycyrrhizin among its active constituents.

Part used: Root

Also Known As

Plain Prepared Licorice Processed Ural Licorice Root Glycyrrhiza

Latin: Radix Glycyrrhizae Praeparata | Pinyin: Zhi Cao | Chinese: 制甘草

TCM Properties

Taste
sweet
Temperature
neutral
Channels
Heart, Lung, Spleen, Stomach

Traditional Use

Primary Actions

  • Harmonizes formulas and moderates urgency ... this prepared licorice lane is used to ease abdominal spasm, coordinate stronger herbs, and soften harsh formula edges.
  • Supports the middle burner and gentle Qi recovery ... it is used for fatigue, weak digestion, and deficiency patterns needing a simpler prepared licorice support than the glossier honey-fried Zhi Gan Cao lane.
  • Relieves cough and soothes the throat-Lung axis ... prepared licorice remains relevant for lingering cough and formula harmonization in respiratory prescriptions.

Secondary Actions

  • This page should stay distinct from `prepared-liauorice-root` ... that sibling is the explicitly honey-fried, glossy Zhi Gan Cao lane, while this record follows the drier, plainer prepared-root slices shown in the local prompt and plate.
  • Clinically the two lanes are neighboring members of the prepared licorice tradition, so the difference here is one of processing emphasis and dispensing identity rather than a separate source species.

Classic Formulas

  • Li Zhong Tang ... prepared licorice supports middle-burner warming and formula harmony.
  • Shao Yao Gan Cao Tang ... sweet moderation of spasm and pain is a core licorice function.
  • Many cough and deficiency formulas ... prepared licorice often appears as the harmonizing root rather than the headline herb.

Classical References

  • Traditional medicine repeatedly emphasizes Gan Cao's role in tonifying, moderating urgency, relieving spasm, and harmonizing formulas.
  • Prepared licorice forms are used when a milder, more supportive direction is wanted than raw detoxifying Gan Cao.

Modern Research

Active Compounds

  • Glycyrrhizin ... major triterpene saponin tied to both therapeutic effects and pseudoaldosteronism risk
  • Glycyrrhetinic acid ... active metabolite linked to mineralocorticoid-like adverse effects
  • Liquiritin, liquiritigenin, and isoliquiritigenin ... major flavonoid constituents discussed in pharmacology reviews

Studied Effects

  • A clinical-trial-oriented review summarized the pharmacological efficacy and safety of licorice root, reinforcing its broad anti-inflammatory and harmonizing relevance while also underscoring safety limits (PMID 31874059).
  • A 2023 study comparing honey-fried licorice with other fried licorice forms showed that processing materially changes chemical composition and pharmacologic direction, directly supporting the idea that this plainer prepared lane should not be collapsed into the honey-fried sibling (PMID 36270557).
  • A narrative review on licorice-induced pseudoaldosteronism documented the clinically important risks of edema, hypertension, hypokalemia, and arrhythmia from glycyrrhizin exposure ... risks that still matter for prepared licorice products (PMID 34604277).

PubMed References

Safety & Interactions

Contraindications

  • Uncontrolled hypertension, edema, hypokalemia, or severe heart failure
  • High-dose or prolonged unsupervised use

Cautions

  • Prepared licorice is still real licorice and still carries glycyrrhizin-related risks.
  • Even when the preparation style is drier and less glossy than honey-fried licorice, it can still promote fluid retention, raise blood pressure, and lower potassium in susceptible patients.

Drug Interactions

  • Loop or thiazide diuretics ... additive potassium loss and arrhythmia risk
  • Digoxin and other cardiac glycosides ... hypokalemia may increase toxicity risk
  • Corticosteroids ... additive mineralocorticoid-like effects
  • Antihypertensives or antiarrhythmics ... electrolyte shifts may complicate therapy

Conditions

Frequently Asked Questions

What is Prepared Licorice Root used for?

Prepared Licorice Root is traditionally used to Harmonizes formulas and moderates urgency ... this prepared licorice lane is used to ease abdominal spasm, coordinate stronger herbs, and soften harsh formula edges., Supports the middle burner and gentle Qi recovery ... it is used for fatigue, weak digestion, and deficiency patterns needing a simpler prepared licorice support than the glossier honey-fried Zhi Gan Cao lane., Relieves cough and soothes the throat-Lung axis ... prepared licorice remains relevant for lingering cough and formula harmonization in respiratory prescriptions.. Research has investigated its effects on: A clinical-trial-oriented review summarized the pharmacological efficacy and safety of licorice root, reinforcing its broad anti-inflammatory and harmonizing relevance while also underscoring safety limits (PMID 31874059).; A 2023 study comparing honey-fried licorice with other fried licorice forms showed that processing materially changes chemical composition and pharmacologic direction, directly supporting the idea that this plainer prepared lane should not be collapsed into the honey-fried sibling (PMID 36270557)..

What are other names for Prepared Licorice Root?

Prepared Licorice Root is also known as Plain Prepared Licorice, Processed Ural Licorice Root, Glycyrrhiza. In TCM: 制甘草 (Zhi Cao); Radix Glycyrrhizae Praeparata.

Is Prepared Licorice Root safe during pregnancy?

The safety of Prepared Licorice Root during pregnancy has not been established. Consult a qualified healthcare provider before use.

What are the contraindications for Prepared Licorice Root?

Prepared Licorice Root should not be used in: Uncontrolled hypertension, edema, hypokalemia, or severe heart failure; High-dose or prolonged unsupervised use. Consult a qualified practitioner before use.

Does Prepared Licorice Root interact with any medications?

Prepared Licorice Root may interact with: Loop or thiazide diuretics ... additive potassium loss and arrhythmia risk; Digoxin and other cardiac glycosides ... hypokalemia may increase toxicity risk; Corticosteroids ... additive mineralocorticoid-like effects; Antihypertensives or antiarrhythmics ... electrolyte shifts may complicate therapy. Always inform your healthcare provider of any herbal supplements you are taking.