To use fluocinolone acetonide shampoo for dandruff and an itchy scalp, first wet your hair and scalp thoroughly. Apply a small amount of the shampoo to your scalp, massage it to lather, and leave it on for 5 minutes. Rinse your scalp and hair completely with water. Typically, this medicated shampoo is used once daily for up to 2 weeks, or until your symptoms improve. Because it is a topical corticosteroid, avoid using it for longer than 2 weeks without consulting your doctor to prevent thinning of the scalp skin. If your symptoms persist, please follow up with your healthcare provider.