Clotrimazole

Clotrimazole, sold under the brand name Lotrimin, among others, is an antifungal medication.[1] It is used to treat vaginal yeast infections, oral thrush, diaper rash, tinea versicolor, and types of ringworm including athlete's foot and jock itch.[1] It can be taken by mouth or applied as a cream to the skin or in the vagina.[1]

Not to be confused with Clomethiazole, Chlormidazole, or Co-trimoxazole.
Clotrimazole
Clinical data
Trade namesDesenex, CalmYourself, others
AHFS/Drugs.comMonograph
MedlinePlusa682753
Pregnancy
category
  • AU: A
Routes of
administration		Topical, throat lozenge
ATC code
Legal status
Legal status
  • US: OTC (topical), Rx-only (by mouth)
Pharmacokinetic data
BioavailabilityPoor absorption by mouth (lozenge), negligible absorption through intact skin (topical)
Protein binding90%
MetabolismLiver
Elimination half-life2 hours
Identifiers
IUPAC name
  • 1-[(2-Chlorophenyl)(diphenyl)methyl]-1H-imidazole
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.041.589
Chemical and physical data
FormulaC22H17ClN2
Molar mass344.84 g·mol−1
3D model (JSmol)
Melting point147 to 149 °C (297 to 300 °F)
SMILES
  • Clc1ccccc1C(c2ccccc2)(c3ccccc3)n4ccnc4
InChI
  • InChI=1S/C22H17ClN2/c23-21-14-8-7-13-20(21)22(25-16-15-24-17-25,18-9-3-1-4-10-18)19-11-5-2-6-12-19/h1-17H Y
  • Key:VNFPBHJOKIVQEB-UHFFFAOYSA-N Y
  (verify)

Common side effects when taken by mouth include nausea and itchiness.[1] When applied to the skin, common side effects include redness and a burning sensation.[1] In pregnancy, use on the skin or in the vagina is believed to be safe.[1] There is no evidence of harm when used by mouth during pregnancy but this has been less well studied.[1] When used by mouth, greater care should be taken in those with liver problems.[1] It is in the azole class of medications and works by disrupting the fungal cell membrane.[1]

Clotrimazole was discovered in 1969.[2] It is on the World Health Organization's List of Essential Medicines.[3] It is available as a generic medication.[1]

Medical uses

It is commonly available without a prescription in various dosage forms, such as a topical cream, ointment, or vaginal suppository. It is also available as an oral troche or throat lozenge as a prescription only. Topically, clotrimazole is used for vulvovaginal candidiasis (yeast infection) or yeast infections of the skin. For vulvovaginal candidiasis, clotrimazole tablets and creams are inserted into the vagina. Topical clotrimazole is usually not effective in treatment of fungal infections of the scalp or nails. When using over-the-counter drug clotrimazole products, use should be discontinued if condition does not improve after treatment for 2 weeks for jock itch or after 4 weeks for athlete's foot or ringworm.[4]

Throat lozenge preparations are used for oropharyngeal candidiasis (oral thrush) or prevention of oral thrush in people with neutropenia.[4]

Clotrimazole is usually used five times daily for 14 days for oral thrush, twice daily for 2 to 8 weeks for skin infections, and once daily for 3 or 7 days for vaginal infections.[5]

Clotrimazole may be compounded with a glucocorticoid, such as betamethasone, in a topical cream for the treatment of tinea corporis (ringworm), tinea cruris (jock itch) and tinea pedis (athlete's foot). Although FDA approved, clotrimazole–betamethasone combination cream is not the preferred treatment for dermatophyte infections due to increased side effects from the topical glucocorticoid. Although temporary relief and partial suppression of symptoms may be observed with the combination therapy, glucocorticoids can elicit an immunosuppressive response and rebound effect that results in more severe infection typically requiring systemic antifungal agents to treat the disease. Combination creams are best avoided in order to improve treatment outcome, reduce the possibility of skin atrophy associated with prolonged topical glucocorticoid use, and to limit the cost of treatment. It can be effective in treating chronic paronychia. The preferred treatment of tinea infections is therefore with clotrimazole monotherapy.[6]

Topical and oral clotrimazole can be used in both adults and children.

Additionally, clotrimazole may be used to treat the sickling of cells (related to sickle cell anemia).[7][8]

It can be taken by mouth as a lozenge or troche or applied as a topical cream to the skin or in the vagina.[1][9]

Pregnancy

Topical clotrimazole is categorized as pregnancy category B.[10] Small amounts of clotrimazole may be absorbed systemically following topical and vaginal administration. However, topical clotrimazole is still considered safe to use to treat yeast infections in pregnant women and is a safer alternative to other antifungals.[10][11]

Side effects

Side effects of the oral formulation include itching, nausea, and vomiting. Less than 10% of patients using the oral formulation may have abnormal liver function tests. Side effects include rash, hives, blisters, burning, itching, peeling, redness, swelling, pain or other signs of skin irritation.[1] For this reason, liver function tests should be monitored periodically when taking the oral clotrimazole (troche). When used to treat vulvovaginal candidiasis (yeast infection), less than 10% of patients have vulvar or vaginal burning sensation. Less than 1% of patients have the following side effects: burning or itching of penis of sexual partner; polyuria; vulvar itching, soreness, edema, or discharge.[5][9][12]

Clotrimazole creams and suppositories contain oil which may weaken latex condoms and diaphragms.[11]

For topical formulations, should be used externally and should be discontinued if irritation or sensitivity develops at the site of administration.[13]

Interactions

There are no known significant drug interactions with topical clotrimazole. However, with oral (troche) clotrimazole, there are multiple interactions as the medication is a CYP450 enzyme inhibitor, primarily CYP3A4. Thus, any medication that is metabolized by the CYP3A4 enzyme will potentially have elevated levels when oral clotrimazole is used. The prescribing physician should be aware of any medication the patient is taking prior to starting oral clotrimazole. Certain medications should not be taken with oral clotrimazole.[12]

Pharmacology

Pharmacodynamics

Clotrimazole is an imidazole derivative which works by inhibiting the growth of individual Candida or fungal cells by altering the permeability of the fungal cell wall.[9] It binds to phospholipids in the cell membrane and inhibits the biosynthesis of ergosterol and other sterols required for cell membrane production.[9][12] Clotrimazole may slow fungal growth or result in fungal cell death.[1]

Sales volume
Canesten brand Clotrimazole antifungal cream

Clotrimazole is available as a generic medication,[1] and in 2016 Canesten brand Clotrimazole was one of the biggest-selling branded over-the-counter medications sold in Great Britain, with sales of £39.2 million.[14]

References
  1. American Society of Health-System Pharmacists (8 February 2016). "Clotrimazole Monograph for Professionals". www.drugs.com. Archived from the original on 28 October 2016. Retrieved 28 October 2016.
  2. Walker SR (2012). Trends and Changes in Drug Research and Development. Springer Science & Business Media. p. 109. ISBN 9789400926592. Archived from the original on 14 September 2016.
  3. World Health Organization (2019). World Health Organization model list of essential medicines: 21st list 2019. Geneva: World Health Organization. hdl:10665/325771. WHO/MVP/EMP/IAU/2019.06. License: CC BY-NC-SA 3.0 IGO.
  4. "UpToDate". www.uptodate.com. Retrieved 7 August 2019.
  5. "Clotrimazole: MedlinePlus Drug Information". The American Society of Health-System Pharmacists, Inc. Archived from the original on 18 April 2014. Retrieved 17 April 2014.
  6. Moriarty B, Hay R, Morris-Jones R (July 2012). "The diagnosis and management of tinea". BMJ. 345: e4380. doi:10.1136/bmj.e4380. PMID 22782730. S2CID 38106083.
  7. Marieb EN, Hoehn K. Human Anatomy and Physiology. Toronto: Pearson. p. 643.
  8. Rodgers G. "Hydroxyurea and other disease-modifying therapies in sickle cell disease". UpToDate. Archived from the original on 15 April 2014. Retrieved 14 April 2014.
  9. "Clotrimazole (Oral)". Lexicomp Online. Archived from the original on 23 January 2015. Retrieved 17 April 2014.
  10. Patel VM, Schwartz RA, Lambert WC (September 2017). "Topical antiviral and antifungal medications in pregnancy: a review of safety profiles". Journal of the European Academy of Dermatology and Venereology. 31 (9): 1440–1446. doi:10.1111/jdv.14297. PMID 28449377. S2CID 544751.
  11. "Diseases Characterized by Vaginal Discharge". CDC. Archived from the original on 28 April 2014. Retrieved 17 April 2014.
  12. "Clotrimazole". DrugBank. Archived from the original on 17 April 2014. Retrieved 17 April 2014.
  13. "DailyMed - CLOTRIMAZOLE ANTIFUNGAL- clotrimazole cream". dailymed.nlm.nih.gov. Retrieved 7 August 2019.
  14. "A breakdown of the over-the-counter medicines market in Britain in 2016". Pharmaceutical Journal. 28 April 2017. Archived from the original on 22 October 2019. Retrieved 29 May 2017.
  • "Clotrimazole". Drug Information Portal. U.S. National Library of Medicine.
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