Menthol is an ingredient of many cough and cold remedies and is used as an inhalent to relieve symptoms of bronchitis, sinusitis and similar conditions. It can also be used as an ointment for application to the chest or nostrils. If menthol accidentally comes into contact with the eye, it produces a temporary burning sensation lasting 15-30 minutes, but there are no after effects. In contrast, menthol causes "severe damage" to the rabbit's eye.(1)
1) W M Grant, Toxicology of the Eye, 2nd edition (Charles Thomas,1974).
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