the 1930s. Selenium sulfide Selsun Blue , Vichy Dercos Anti-Dandruff shampoo, other varieties of Head & Shoulders In the United States, 1% strength is available over-the-counter , and a 2.5% strength is also available with a prescription . Tar [14] Neutrogena T/Gel Tea tree oil [15] See also Fungicide Antimicrobial For