[2] Mequinol is a common active ingredient in topical drugs used for skin depigmentation.

A common formulation for this drug is an ethanolic solution of 2% mequinol and 0.01% tretinoin by mass.

[1] Dermatologists commonly prescribe the drug to treat liver spots.

Lower dosages of mequinol have been used in conjunction with a Q-switched laser to depigment skin in patients with disseminated idiopathic vitiligo.

[4][5] The U.S. National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 5 mg/m3 over an 8-hour workday.