Home / Hair Loss Treatments / Scientifically Proven Treatments / Proscar Proscar Hair Loss Treatment Type: 5-alpha reductase inhibitor Availability: Prescription Notes: Proscar, a.k.a. Finasteride, is one of many anti-androgens. Proscar is mainly prescribed for treatment of enlarged prostates in men. Proscar functions by preventing testosterone from being converted into dihydrotestosterone (DHT), the primary hormone related to male pattern hair loss. A 1mg form of Proscar, Propecia, has been approved by the FDA for the treatment of hair loss. Claimed Results: None. Observed Results: Halting of hair loss to dense regrowth. Clinical Results: Inhibits DHT production by 55-70%. Testing: Extensive. Safety/Side Effects: In 2-5% of patients using the full dosage, some loss of sex drive, loss of sexual sensitivity, and lowers amount of ejaculate (doesn’t affect sperm count). Gender: Primarily Male. Typical Cost: $45-75 for 30 5mg pills ($55-60 average) Related Pages Proscar Hair Loss FAQ Proscar/Propecia Hair Loss Survey Hair growth effects of oral administration of finasteride, a steroid 5 alpha-reductase inhibitor, alone and in combination with topical minoxidil in the balding stumptail macaque The effect of finasteride, a 5 alpha-reductase inhibitor, on scalp skin testosterone and dihydrotestosterone concentrations in patients with male pattern baldness Effect of finasteride, a 5 alpha-reductase inhibitor on prostate tissue androgens and prostate-specific antigen Proscar: five-year experience Proscar: five-year experience Local and systemic reduction by topical finasteride or flutamide of hamster flank organ size and enzyme activity Activity of the type 1 5 alpha-reductase exhibits regional differences in isolated sebaceous glands and whole skin Inhibition of steroid 5 alpha-reductase with finasteride: sleep-related erections, potency, and libido in healthy men Effects of finasteride (MK-906), a 5 alpha-reductase inhibitor, on circulating androgens in male volunteers Early Proscar Hair Loss Study Status of Medical Treatment for Androgenic Alopecia 5 alpha-metabolism in finasteride-treated subjects and male pseudohermaphrodites with inherited 5 alpha-reductase deficiency. A review.