A waste of money, IMO. The only advantage to using a higher dose is you get from point A to point B sooner. The clinical data I have seen showed 5 mg of finasteride achieved maximum hair count in 6 months, while 1 mg took 1 year to get to the same point. You are better off sticking with 1 mg or less, its cheaper, may be a bit easier on side effects, and ultimately just as effective.