Coal tar shampoo is available in over-the-counter (OTC) preparations that ... a doctor may prescribe a shampoo containing clobetasol propionate, a potent topical steroid. A person can use a ...

Mack Rachal, MD, PhD: Generally you want to shampoo three to five times ... The 1% preparation is over-the-counter. Clobetasol is probably the most popular one. The reason you have these different ...