Etrivex Medicated Shampoo 125 ml is a Moderate scalp psoriasis topical therapy for adults. Colourless to light yellow, clear-colored, alcoholic-scented liquid shampoo. Used for inflammatory skin, itching and other symptoms. t should be applied thinly on a dry scalp once a day to massage the shampoo for 15 minutes in the affected skin areas. Can not be used at a time for more than four weeks.