Menthol is a terpene derivative.

It is traditionally used as a respiratory antiseptic.

Menthol activates at low doses the nerve receptors sensitive to cold present in the nasal vestibule and in the upper airways, thus providing a feeling of freshness and improved breathing and decongestion.

Locally, it is rubefacient and revulsive. The activity of menthol is exerted on the nerve endings of the skin.