I just bough selsun blue with selenium sulfide how to apply ?, how long till you rinse it?, and how often i need to re do ? 1every week, 1 every 2 week

Seborrhea: Selsun blue is a brand name shampoo for the treatment of seborrhea (dandruff). Most people benefit by shampooing to a good lather and then letting the medication sit on the scalp for about 5 minutes. You want this time to penetrate the scalp. Depending on your severity depends how often you may use it. If it is severe a dermatologist can rx a stronger shampoo if needed.