Studies suggest that ketoconazole impairs the synthesis of ergosterol ... Reevaluate if no improvement in 2–4 weeks. Changes in hair texture, scalp pustules, dry or oily scalp or hair, pruritus.

If you use a shampoo with more than 2 percent ketoconazole then it can lead to dryness and scalp irritation. Serious allergic reactions are not common but can happen. You may have a rash ...

An £8 bottle of shampoo could be the ultimate answer to hair loss, according to dermatologists. Nizoral ... The product contains ketoconazole, which destroys the fungus that causes dandruff ...