Directions This freshly scented anti-dandruff shampoo eliminates flaking, irritation, and itching. Directions Wet hair. Apply a small amount to the scalp. Lather. For best results, leave on the scalp for 3-5 minutes. Rinse thoroughly. For the first 2-4 weeks: Use every 3-4 days. Thereafter: Use once every 1 or 2 weeks to prevent dandruff from recurring.