Methylchloroisothiazolinone

DB14197ApprovedSmall moleculeStandardized Chemical Allergen

Methylchloroisothiazolinone (MCI) is an isothiazolinone commonly used as a preservative with antibacterial and antifungal properties. It is found within many commercially available cosmetics, lotions, and makeup removers. It is also... It is also a known dermatological sensitizer and allergen; some of its side effects include flaky or scaly skin, breakouts, redness or itchiness, and moderate to severe swelling in the eye area.

Chemical structure of Methylchloroisothiazolinone
Primary indication
Methylchloroisothiazolinone is approved for use within allergenic epicutaneous patch tests which are indicated for use as an aid in the diagnosis of allergic contact dermatitis (ACD) in persons 6 years of age and older.Curator reviewed
Formula / weight
C4H4ClNOS · 149.59 g/mol (avg)
First approval
United States, 2012

Resolves to

Clinical / RWD
Structure

What you can answer from here — as of April 02, 2025

5Marketed productsAcross 1 country and 4 labellers
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3+ReferencesStructured and connected to the statements they support
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Which companies are running trials of Methylchloroisothiazolinone, in which indications and phases, and which of those programs are still active?

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