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Updated: Mar 19, 2026

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Cantharidin, a blistering beetle toxin, offers painless topical treatment for warts and molluscum contagiosum by inducing acantholysis. However, it lacks FDA approval due to potential toxicity upon ingestion.

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Area of Science:

  • Dermatology
  • Toxicology
  • Pharmacology

Background:

  • Cantharidin is a natural toxin from the blistering beetle with vesicant and keratolytic properties.
  • It functions by inducing acantholysis, disrupting desmosomes and tonofilaments.
  • Two preparations, Canthacur and Canthacur PS, exist for dermatologic use.

Purpose of the Study:

  • To discuss the mechanism of action, indications, application techniques, and complications of cantharidin preparations.
  • To review the dermatologic uses of cantharidin for conditions like warts and molluscum contagiosum.
  • To highlight the lack of FDA approval and associated toxic effects.

Main Methods:

  • Literature review of cantharidin's properties and uses.
  • Analysis of available cantharidin formulations and their indications.
  • Discussion of toxicological data and safety concerns.

Main Results:

  • Cantharidin preparations provide painless treatment for warts and molluscum contagiosum with comparable efficacy to other methods.
  • Canthacur is indicated for common and periungual warts and molluscum contagiosum.
  • Canthacur PS is indicated for plantar warts.
  • Neither preparation is FDA-approved due to significant oral toxicity risks.

Conclusions:

  • Cantharidin offers an effective, painless topical treatment option for specific dermatologic conditions.
  • The lack of FDA approval necessitates careful consideration of its toxic potential, particularly oral ingestion risks.
  • Further research or regulatory action may be needed to address safety concerns and facilitate broader clinical adoption.