Question about washing your hair

[thinkingaboutit]

OK, this question may sound a bit silly.

I had FUE and I am on Regaine and Propecia. Now I use Regaine in the morning and 12 hours later before I sleep.

How often should I be washing my hair. I am concerned if I wash my hair too often, then I would be washing all the Regaine out, so not benefitting. At the same time, I have been told in the past that if you wash your hair too often with shampoo, it takes all the natural oils, that your head/body produces out, so it can actually make you go bald faster. I don't know if there is any truth to this and this may be an old wives tale.

At the moment, my head has recently felt itchy. I don't want to be an un-hygenic person, but I am probably washing my head twice a week, just mainly because I am probably being over cautious.