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Cantharidin (On the skin)

Cantharidin (kan-THER-e-den)

There may be other brand names for this medicine.

This medicine is not right for everyone. You should not receive it if you had an allergic reaction to cantharidin.

Use this medicine only on your skin. Rinse it off right away if it gets on a cut or scrape. Do not get the medicine in your eyes, nose, or mouth.
A nurse or other trained health professional will give you this medicine.
Do not apply topical steroids, creams, lotions, or sunscreen to the affected area.
Allow the medicine to dry for up to 5 minutes. Do not touch or allow the treated area to come in contact with your mouth, nose, genitals, or eyes for at least 24 hours after application or until washing.
Do not allow children to lick or bite the treated areas. Do not inhale vapors from the topical solution during treatment.
Do not cover the treated area with a bandage unless directed by your doctor.
This medicine is flammable. Avoid fire, flame, or smoking near lesions during and after treatment until it is washed off of your skin.

Tell your doctor if you are pregnant or breastfeeding.
This medicine may cause the following problems:
- Eye problems (if it gets into your eyes)
- Skin reactions
Your doctor will do lab tests at regular visits to check on the effects of this medicine. Keep all appointments.

Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
Changes in skin color, flushing, redness, swelling of the treated area

Last Updated: 4/23/2024