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Glycyrrhetinic acid structure.svg
Clinical data
Trade namesArthrodont, PruClair
AHFS/Drugs.comInternational Drug Names
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Oral, topical
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Legal status
  • (2S,4aS,6aS,6bR,8aR,10S,12aS,12bR,14bR)-10-hydroxy-2,4a,6a,6b,9,9,12a-heptamethyl-13-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,12b,13,14b-icosahydropicene-2-carboxylic acid
CAS Number
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CompTox Dashboard (EPA)
ECHA InfoCard100.006.769 Edit this at Wikidata
Chemical and physical data
Molar mass470.6838 g·mol−1
3D model (JSmol)
  • O=C(O)[C@]5(C)C[C@H]4/C3=C/C(=O)[C@H]1[C@](CC[C@@H]2[C@]1(C)CC[C@H](O)C2(C)C)(C)[C@]3(C)CC[C@@]4(C)CC5
  • InChI=1S/C30H46O4/c1-25(2)21-8-11-30(7)23(28(21,5)10-9-22(25)32)20(31)16-18-19-17-27(4,24(33)34)13-12-26(19,3)14-15-29(18,30)6/h16,19,21-23,32H,8-15,17H2,1-7H3,(H,33,34)/t19-,21-,22-,23+,26+,27-,28-,29+,30+/m0/s1

Enoxolone (INN, BAN; also known as glycyrrhetinic acid or glycyrrhetic acid) is a pentacyclic triterpenoid derivative of the beta-amyrin type obtained from the hydrolysis of glycyrrhizic acid, which was obtained from the herb liquorice. It is used in flavoring and it masks the bitter taste of drugs like aloe and quinine. It is effective in the treatment of peptic ulcer and also has expectorant (antitussive) properties.[1] It has some additional pharmacological properties with possible antiviral, antifungal, antiprotozoal, and antibacterial activities.[2][3][4][5]

Mechanism of action[edit]

Glycyrrhetinic acid inhibits the enzymes (15-hydroxyprostaglandin dehydrogenase and delta-13-prostaglandin) that metabolize the prostaglandins PGE-2 and PGF-2α to their respective, inactive 15-keto-13,14-dihydro metabolites. This increases prostaglandins in the digestive system. Prostaglandins inhibit gastric secretion, stimulate pancreatic secretion and mucous secretion in the intestines, and markedly increase intestinal motility. They also cause cell proliferation in the stomach. The effect on gastric acid secretion, and promotion of mucous secretion and cell proliferation shows why licorice has potential in treating peptic ulcers.[6]

Licorice should not be taken during pregnancy, because PGF-2α stimulates activity of the uterus during pregnancy and can cause abortion.[citation needed]

The structure of glycyrrhetinic acid is similar to that of cortisone. Both molecules are flat and similar at positions 3 and 11. This might be the basis for licorice's anti-inflammatory action.[citation needed]

3-β-D-(Monoglucuronyl)-18-β-glycyrrhetinic acid, a metabolite of glycyrrhetinic acid, inhibits the conversion of 'active' cortisol to 'inactive' cortisone in the kidneys.[7] This occurs via inhibition of the enzyme 11-β-hydroxysteroid dehydrogenase.[citation needed] As a result, cortisol levels become high within the collecting duct of the kidney. Cortisol has intrinsic mineralocorticoid properties (that is, it acts like aldosterone and increases sodium reabsorption) that work on ENaC channels in the collecting duct.[citation needed]Hypertension develops due to this mechanism of sodium retention. People often have high blood pressure with a low renin and low aldosterone blood level.[citation needed] The increased amounts of cortisol binds to the unprotected, nonspecific mineralocorticoid receptors and induce sodium and fluid retention, hypokalaemia, high blood pressure, and inhibition of the renin-angiotensin-aldosterone system. Therefore, licorice should not be given to patients with a known history of hypertension in doses sufficient to inhibit 11-β-hydroxysteroid dehydrogenase.[8]


Glycyrrhetinic acid derivatives, where R is a variable functional group

In glycyrrhetinic acid, the functional group (R) is a hydroxyl group. Research in 2005 demonstrated that with a proper functional group a very effective glycyrrhetinic artificial sweetener can be obtained.[9] When R is an anionic NHCO(CH2)CO2K side chain, the sweetening effect is found to be 1200 times that of sugar (human sensory panel data). A shorter or longer spacer reduces the sweetening effect. One explanation is that the taste bud cell receptor has 1.3 nanometers (13 angstroms) available for docking with the sweetener molecule. In addition, the sweetener molecule requires three proton donor positions, of which two reside at the extremities, to be able to interact efficiently with the receptor cavity.

A synthetic analog, carbenoxolone, was developed in Britain.[citation needed] Both glycyrrhetinic acid and carbenoxolone have a modulatory effect on neural signaling through gap junction channels.

Acetoxolone, the acetyl derivative of glycyrrhetinic acid, is a drug used in the treatment of peptic ulcer and gastroesophageal reflux disease.

SARS-CoV and COVID-19 Therapeutic[edit]

It has an anti-inflammatory effect. Highly effective antiviral, effective against influenza, SARS CoV and SARS CoV-2 (COVID-19) viruses.[10][11][12][13] Excessive consumption lowers potassium levels in the blood, which in turn raises blood pressure as well as lowers blood sugar levels. Its side effects can be offset by potassium and carbohydrate supplementation, and can be offset by consuming bananas naturally.[citation needed]

See also[edit]


  1. ^ Chandler RF (1985). "Liquorice, more than just a flavour". Canadian Pharmaceutical Journal (118): 420–4.
  2. ^ Badam L (June 1997). "In vitro antiviral activity of indigenous glycyrrhizin, licorice and glycyrrhizic acid (Sigma) on Japanese encephalitis virus". The Journal of Communicable Diseases. 29 (2): 91–99. PMID 9282507.
  3. ^ Fuji HY, Tian J, Luka C (1986). "Effect of glycyrrhetinic acid on influenza virus and pathogenic bacteria". Bull. Chin. Mater. Med. 11: 238–241.
  4. ^ Guo N (October 1991). "[Protective effect of glycyrrhizine in mice with systemic Candida albicans infection and its mechanism]". Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae. 13 (5): 380–383. PMID 1839259.
  5. ^ Salari MH, Sohrabi N, Kadkhoda Z, Khalili MB (2003). "Antibacterial effects of Enoxolone on periodontopathogenic capnophilic bacteria isolated from specimens of periodontitis patients". Iranian Biomedical Journal. 7: 39–42.
  6. ^ Baker ME (February 1994). "Licorice and enzymes other than 11 beta-hydroxysteroid dehydrogenase: an evolutionary perspective". Steroids. 59 (2): 136–141. doi:10.1016/0039-128X(94)90091-4. PMID 8191543. S2CID 25938108.
  7. ^ Kato H, Kanaoka M, Yano S, Kobayashi M (June 1995). "3-Monoglucuronyl-glycyrrhetinic acid is a major metabolite that causes licorice-induced pseudoaldosteronism". The Journal of Clinical Endocrinology and Metabolism. 80 (6): 1929–1933. doi:10.1210/jcem.80.6.7775643. PMID 7775643.
  8. ^ van Uum SH (April 2005). "Liquorice and hypertension". The Netherlands Journal of Medicine. 63 (4): 119–120. PMID 15869038.
  9. ^ Ijichi S, Tamagaki S (2005). "Molecular Design of Sweet Tasting Compounds Based on 3β-Amino-3β-deoxy-18β-glycyrrhetinic Acid: Amido Functionality Eliciting Tremendous Sweetness". Chemistry Letters. 34 (3): 356–357. doi:10.1246/cl.2005.356. Retrieved 2010-09-28.[permanent dead link]
  10. ^ Bailly C, Vergoten G (October 2020). "Glycyrrhizin: An alternative drug for the treatment of COVID-19 infection and the associated respiratory syndrome?". Pharmacology & Therapeutics. 214: 107618. doi:10.1016/j.pharmthera.2020.107618. PMC 7311916. PMID 32592716.
  11. ^ Hoever G, Baltina L, Michaelis M, Kondratenko R, Baltina L, Tolstikov GA, et al. (February 2005). "Antiviral activity of glycyrrhizic acid derivatives against SARS-coronavirus". Journal of Medicinal Chemistry. 48 (4): 1256–1259. doi:10.1021/jm0493008. PMID 15715493.
  12. ^ Pilcher, HelenR (2003-06-13). "Liquorice may tackle SARS". Nature. doi:10.1038/news030609-16. ISSN 1476-4687. PMC 7095480.
  13. ^ Cinatl J, Morgenstern B, Bauer G, Chandra P, Rabenau H, Doerr HW (June 2003). "Glycyrrhizin, an active component of liquorice roots, and replication of SARS-associated coronavirus". Lancet. 361 (9374): 2045–2046. doi:10.1016/s0140-6736(03)13615-x. PMC 7112442. PMID 12814717.

Further reading[edit]

External links[edit]

  • Media related to Enoxolone at Wikimedia Commons