No, of course rubbing alcohol will dry your scalp and your skin, and I cannot imagine that this prolonged exposure to the strength of alcohol in retail solutions could be helpful to a health condition, unless your physician has expressly advised it otherwise... For what condition are you considering this?
No! It will dry out your hair and cause it to become brittle and then you'll have lots of breakage. You need to use hot oil treatments, etc. They are good for hair and scalp.