itself can cause hairfall. For your dandruff you could use a ketoconazole
shampoo to wash your scalp. If it is severe you may need tablets for a few days. You can use the shampoo to wash your hair daily for a month and then reduce the frequency to alternate days for the 2nd month. Weekly once or twice for maintainence. Please get it checked by a dermatologist
in case your hairloss persists even after dandruff is under control.