Chemistry:Miconazole

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Short description: Chemical compound
Miconazole
Miconazole.svg
Miconazole ball-and-stick.png
Clinical data
Trade namesDesenex, Monistat, Oravig, others
AHFS/Drugs.comMonograph
MedlinePlusa601203
Routes of
administration		Topical, vaginal, sublabial
ATC code
Legal status
Legal status
  • AU: S2 (Pharmacy medicine) Schedule 2 for topical formulations, schedule 3 for vaginal use and for oral candidiasis, otherwise schedule 4[citation needed]
  • UK: POM (Prescription only)
  • US: OTC / Rx-only[1]
Pharmacokinetic data
Bioavailability<1% after application to the skin
Protein binding88.2%
MetabolismCYP3A4
Elimination half-life20–25 hrs
ExcretionMainly feces
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
Chemical and physical data
FormulaC18H14Cl4N2O
Molar mass416.12 g·mol−1
3D model (JSmol)
ChiralityRacemic mixture
  (verify)

Miconazole, sold under the brand name Monistat among others, is an antifungal medication used to treat ring worm, pityriasis versicolor, and yeast infections of the skin or vagina.[2] It is used for ring worm of the body, groin (jock itch), and feet (athlete's foot).[2] It is applied to the skin or vagina as a cream or ointment.[2][3]

Common side effects include itchiness or irritation of the area in which it was applied.[2] Use in pregnancy is believed to be safe for the baby.[4] Miconazole is in the imidazole family of medications.[2] It works by decreasing the ability of fungi to make ergosterol, an important part of their cell membrane.[2]

Miconazole was patented in 1968 and approved for medical use in 1971.[5] It is on the World Health Organization's List of Essential Medicines.[6]

Medical uses

Miconazole is used externally for the treatment of ringworm, jock itch, and athlete's foot.[2] Internal application is used for oral candidiasis or vaginal thrush (yeast infection).[2]

Side effects

Miconazole is generally well tolerated. The oral gel can cause dry mouth, nausea and an unpleasant taste in about 1–10% of people. Anaphylactic reactions are rare. The drug prolongs the QT interval.[7][8]

Interactions

Miconazole is partly absorbed in the intestinal tract when used orally, as with the oral gel, and possibly when used vaginally.[9] This can lead to increased concentrations of drugs that are metabolized by the liver enzymes CYP3A4 and CYP2C9, because miconazole inhibits these enzymes. Such interactions occur for example with anticoagulants of the warfarin type, phenytoin, some newer atypical antipsychotics, ciclosporin, and most statins used to treat hypercholesterolemia.[8]

These interactions are not relevant for miconazole that is applied to the skin.[8]

Contraindications

Miconazole is contraindicated for people who use certain drugs that are metabolized by CYP3A4, for the reasons mentioned above:[8]

  • drugs that also prolong the QT interval because of potential problems with the heart rhythm
  • ergot alkaloids
  • statins
  • triazolam and oral midazolam
  • sulfonamides with a potential to cause hypoglycaemia (low blood sugar)

Pharmacology

Mechanism of action

Miconazole inhibits the fungal enzyme 14α-sterol demethylase, resulting in a reduced production of ergosterol.[10] In addition to its antifungal actions, miconazole, similarly to ketoconazole, is known to act as an antagonist of the glucocorticoid receptor.[11]

Pharmacokinetics

After application to the skin, miconazole can be measured in the skin for up to four days, but less than 1% is absorbed into the bloodstream. When applied to the oral mucosa (and possibly also for vaginal use[9]), it is significantly absorbed. In the bloodstream, 88.2% are bound to plasma proteins and 10.6% to blood cells. The substance is partly metabolized via the liver enzyme CYP3A4 and mainly eliminated via the faeces.[7][8]

Chemistry

The solubilities of miconazole nitrate powder are 0.03% in water, 0.76% in ethanol and up to 4% in acetic acid.[12] Miconazole crystallises as colourless prisms in the monoclinic space group P21/c.[13]

Other uses

Miconazole is also used in Ektachrome film developing in the final rinse of the Kodak E-6 process and similar Fuji CR-56 process,[citation needed] replacing formaldehyde.[14][15] Fuji Hunt also includes miconazole as a final rinse additive in their formulation of the C-41RA rapid access color negative developing process.[citation needed]

Brands and formulations

Vaginal miconazole 20 mg/g - Brazil

Oral treatment: (brand names Daktarin in UK, Fungimin Oral Gel in Bangladesh):[citation needed]

In 2010, the US Food and Drug Administration approved Oravig (miconazole) buccal tablets for the local treatment of oropharyngeal candidiasis, more commonly known as thrush, in adults and children age 16 and older.[1]

External skin treatment (brand names Desenex and Zeasorb in US and Canada, Micatin, Monistat-Derm, Daktarin in India, UK, Australia, Belgium and the Philippines, Daktar in Norway, Fungidal in Bangladesh, Decocort in Malaysia)[citation needed]

Vaginal treatment (brand names Miconazex, Monistat, Femizol or Gyno-Daktarin in UK):[citation needed]

References

  1. ↑ 1.0 1.1 "Oravig- miconazole tablet". 1 January 2022. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=dc2427ff-e566-4b48-b289-9e51c011250a. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 "Miconazole Nitrate". The American Society of Health-System Pharmacists. https://www.drugs.com/monograph/miconazole-nitrate.html. 
  3. ↑ "Miconazole Monograph for Professionals". 22 July 2022. https://www.drugs.com/monograph/miconazole.html. 
  4. ↑ Tarascon Pocket Pharmacopoeia 2015 Deluxe Lab-Coat Edition. Jones & Bartlett Learning. 2015. p. 180. ISBN 9781284057560. 
  5. ↑ (in en) Analogue-based Drug Discovery. John Wiley & Sons. 2006. p. 502. ISBN 9783527607495. https://books.google.com/books?id=FjKfqkaKkAAC&pg=PA502. 
  6. ↑ World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. 2019. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO. 
  7. ↑ 7.0 7.1 (in de) Austria-Codex. Vienna: Österreichischer Apothekerverlag. 2019. Daktarin 2%-Creme. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 (in de) Austria-Codex. Vienna: Österreichischer Apothekerverlag. 2020. Daktarin 2%-orales Gel. 
  9. ↑ 9.0 9.1 British National Formulary '45' March 2003
  10. ↑ "Fungal cytochrome P450 sterol 14α-demethylase (CYP51) and azole resistance in plant and human pathogens". Applied Microbiology and Biotechnology 95 (4): 825–840. August 2012. doi:10.1007/s00253-012-4195-9. PMID 22684327. 
  11. ↑ "Ketoconazole and miconazole are antagonists of the human glucocorticoid receptor: consequences on the expression and function of the constitutive androstane receptor and the pregnane X receptor". Molecular Pharmacology 70 (1): 329–339. July 2006. doi:10.1124/mol.105.022046. PMID 16608920. 
  12. ↑ Thaler I, Strauss R, "Imidazole derivative tincture and method of manufacture", US patent 5461068, issued 24 October 1995, assigned to Current Assignee Corwood Laboratories Incand Bausch Health Companies Inc.
  13. ↑ "A comparison of three crystalline forms of miconazole: solvent-free, ethanol monosolvate and hemihydrate". Acta Crystallographica Section C 78 (Pt 6): 343–350. June 2022. doi:10.1107/S2053229622004909. PMID 35662134. 
  14. ↑ "Kodak Chemicals: Process E-6 Publication: Z-119". 8 October 1999. http://www.kodak.com/global/en/service/Zmanuals/z119.shtml. 
  15. ↑ "Kodak Chemicals: Q-LAB Process Control Handbook: Publication Z-6". 1 November 2004. http://www.kodak.com/global/en/service/Zmanuals/z6.shtml. 



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