Medicated Vaporizing Steam Liquid, 4 oz, QC95032 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Compare to the Active Ingredient in Vicks Vapo Steam. Cough suppressant liquid for hot steam vaporizers to assist in relieving coughs. Produces a medicated, soothing steam containing camphor to help relieve coughs due to colds and the flu, allowing you to rest.