Coloring the Hair and Using Minoxidil, Can It Be Done Safely?

I am a female. My dermatologist recently told me that any kind of hair color should not be used when experiencing hair loss/thinning hair. I’m dealing with thinning hair on my crown and right side of my scalp. I’ve recently started using Rogaine and my derm advised I could use whatever shampoo I wanted, ( I was very surprised at this). I’ve been using semi-perm color on my hair for years and on occasion using perm color. All in the salon ?