Apply a small amount to scalp. Work into a lather.

For best results leave on scalp for 3-5 minutes.

Rinse thoroughly.

For the first 2 to 4 weeks: use every 3 to 4 days to clear dandruff. Thereafter: use once every 1 or 2 weeks to prevent dandruff from coming back. 

If your scalp has not cleared after 4 weeks, you may not have dandruff and should seek further advice from your pharmacist or doctor.

Room temperature

Ketoconazole

https://www.medicines.org.uk/emc/files/pil.6456.pdf