PERIOD. #dandruff #dryscalp #dandruffsolution #dermrecommended #nizoral #dercos What's the best OTC for dandruff?! For dandruff and dry flakey scalps these are my two favorite shampoos you can get over the counter. Use each 1-2 times per week for best results! Dercos contains salicylic acid while Nizoral contains Ketoconazole.