This is a link to a comment made by Dr Richard Lee who is a doctor and someone who works in the field of hair loss. I don't know personally if Dr lee is a doctor or even exists though i do plan do find out these commning weeks(I suggest you do too). Anyway here is the link in which Dr lee comments on ketoconazole.
http://www.hairlosshelp.com/qna/Detail.Cfm?FAQID=5660&ExpertID=8
http://www.hairlosshelp.com/qna/Detail.Cfm?FAQID=5660&ExpertID=8