NIZORAL* Dandruff Shampoo Do you have any NIZORAL* promotions available? Because NIZORAL* Shampoo is concentrated, it may appear more expensive. However, the cost per shampoo is significantly less than other competitive dandruff shampoos. Used correctly, a 60 ml bottle of NIZORAL* should last up to three months.If you take into consideration the fact that you don't need to use as much and that you don't need to use it as often, you might find that NIZORAL* Shampoo is actually less expensive than most anti-dandruff shampoos. On average, the cost per month to use NIZORAL* is about $2.36 compared to over $5.00 for some of the other anti-dandruff products.