Bring home this K B Plus shampoo if you want to get rid of dandruff. This hair cleaning product is also effective at stopping the growth of fungus and provide relief from dry and flaky skin on the scalp. Ketoconazole and zinc pyrithione shampoo must be purchased after consultation with dermatologist or pharmacist. Depending upon the severity of the condition, the length of the treatment is decided. The usual treatment length is two weeks. People can use this shampoo while following the instruction.