Karvol Menthol Vapour Rub Karvol Menthol Vapour Rub helps to achieve clear, easy breathing for children from 6 months of age. It may be applied to chest & neck or for adults it can be used with hot water as an inhalent. Karvol Menthol Vapour Rub provides quick & effective relief from decongestion. Ingredients Eucalyptus, menthol & camphor Directions For children over 6 months old: Gently massage a small amount onto the chest especially at bedtime. Use sparingly on infants & young children. For older children & adults: Rub a moderate amount onto the chest & neck. Or add 1 teaspoon of the rub to 1/2 a pint of hot (not boiling) water & inhale the vapour.