doxylamine

Etymology
Probably from.

Noun

 * 1)  An antihistamine derived from pyridine that is typically used in the form of its succinate C17H22N2O·C4H6O4 to treat respiratory symptoms of the common cold and allergies, to induce sleep in the treatment of insomnia, and in combination with pyridoxine hydrochloride to control nausea and vomiting associated with pregnancy.