The chiropractor I used to go see didn't give me prescription medications, but did recommend and provide me with some herbal remedies (at a price). They did increase my circulation, but were quite expensive. I quit taking them simply because I could not afford them. He also told me several years ago I had Fibromyalgia, but I did not get a second opinion. I decided I was not going to let anything stand in my way and did well health-wise until about six months ago. After all brain scans coming back showing no sign of any damage due to a couple of blackouts I am tempted to go back to see him.
As far as them being considered doctors, they most definitely get a bad rap a lot of the time. I did have one MD that told me I should go see a chiropractor after hurting myself jumping on a trampoline. It was kind of comical, because he was leery about suggesting it to me.