Get lasting relief from itching and flaking with Neutrogena T/Gel Therapeutic and Anti-Dandruff Shampoo. Safe for daily use, this original formula helps control itching and flaking caused by chronic scalp psoriasis, seborrheic dermatitis, and even common dandruff. Scientific tests prove that coal tar extract, the active ingredient in T/Gel Shampoo Original, continues to work for hours even after the shampoo is rinsed off. This dandruff treatment starts working after just one use and you can use this therapeutic shampoo just once a week to reduce dandruff for an entire week. * From a dermatologist-recommended brand, this shampoo helps maintain a healthy scalp and leaves hair clean and manageable. How To Use Wet hair thoroughly. Massage shampoo into your scalp. Lather, leaving on your hair and scalp for a few minutes. Rinse and repeat. * For best results, use at least twice a week or as directed by a doctor.