Products that contain salicylic acid, such as Scalpicin and X-Seb, selenium sulfide, brand names Exsel and Selsun Blue, and zinc pyrithione, including DHS Zinc and Head & Shoulders, are examples of effective over-the-counter. These shampoos should remain on the scalp for several minutes before thoroughly rinsed. These shampoos are generally used daily at first to control symptoms. Once it subsides, you may use them two to three times a week.
