Eucalyptol is a bicyclic monoterpene that has been found in Eucalyptus and other plants, including C. sativa and has diverse biological activities, including anti-inflammatory, decongestant, antinociceptive, and insect repellent properties.^1,2,3,4,5 Eucalyptol (10 μM) inhibits TNF-α, IL-1β, IL-4, and IL-5 production by primary human lymphocytes stimulated by ionomycin and phorbol 12-myristate 13-acetate (PMA).² It also decreases LPS-induced mucus production by primary human nasal turbinate slices when used at a concentration of 10 μM.³ Eucalyptol (400 mg/kg) decreases carrageenan-induced hind paw edema in rats and reduces the time spent licking the hind paw in a formalin-induced nociception test in mice.⁴ It inhibits A. aegypti mosquitoes from feeding on anesthetized gerbils when applied topically at a concentration of 10% and from laying eggs in an ovipositional bioassay when used at a concentration of 1% in standing water.⁵ Formulations containing eucalyptol have been used in mouthwash and cough suppressants.