"5% topical minoxidil applied twice daily was recently proven more efficacious than the previously recommended 2% minoxidil; however, there is a higher incidence of side effects with the stronger preparation such as scalp pruritus, local irritation, and unwanted hypertrichosis (Callender et al., 2004). " --Medscape
topical Ketoconazole (Nizoral), which can lower levels of dihydrotestosterone (DHT), a hormone that can shrink hair follicles and shorten hair’s growth cycle