Vicks VapoRub contains 4 active ingredients- levomenthol, eucalyptus oil, turpentine oil, & camphor. These are traditional medicines used as inhalations for their decongestant and soothing effects.
When the vapor from the medicine is breathed in, the ingredients can help relieve a blocked nose. They also have mild cooling effects that can soothe irritation in the lining of the nose, thereby easing breathing and relieving cough.
The medicine is rubbed on the chest so that the vapor can be breathed in. For adults, the medicine can also be added to.hot water to use as a steam inhalation. In this case, the warm moisture inhaled in the steam will also help liquify & loosen mucus, allowing the airways to be cleared more effectively.
Source: {http://www.m.netdoctor.co.Uk/lung-problems/medicines/Vicks-VapoRub.html}
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