Depends on why you scalp is itchy.

If it is just dry then change your shampoo to head and shoulders or selsem blue. The are dandruff shampoos.

There are also diseases of the scalp so you then need something like scalpasin. I hope I am spelling these correctly.

I would honestly just talk with my pharmacist. If anyone knows there drugs its them. I would also not buy the generic forms of the medicines. Drug store brands are not always like FDA generic drugs.

If that did not work I would see my Dr.

And at the last resort I would see a dermatologist. I say last resort because I have never known anyone who has had true success with one of these Dr's.

Good Luck!