How do you treat dandruff related hair loss?

I switched hair products two weeks ago and I have allergies so I think my skin must be sensitive to it because my scalp dry and then I have bad dandruff which is strange for me was never a problem before. Now my hair looser than normal (much more). I have read several medical websites that dandruff can cause severe hair loss, but did not mention a trattamento.Intende treat dandruff shampoo with medicated solve hair loss as well? I will see my doctor in a few days, but I’m interested in how to handle this from someone knowledgeable or experienced in this settore.Grazie!