A difference that is felt! Denorex® contains an effective anti-dandruff medication in addition to an anti-itch ingredient that no other anti-dandruff shampoo contains. Denorex® Tingling indicates that the product is working to temporarily relieve the itching and flaking associated with dandruff. Denorex® Extra Strength contains medication to control the intractable symptoms of psoriasis, seborrhea and dandruff.