I'm taking oral Spironolactone which is a prescription that my OB GYN wrote for me (low dose). This is after I had blood work done and they realized that my hair loss was DHT related. I suggest you check with your physician before you try to use the spiro just to make sure its right for your situation.
I just recently learned about the Spiro topical creams. For now I'm going to stick with what's working for me.
FYI
Also Saw Palmetto is definitely worth checking into for internal and external use!
ETA: I just started drinking nettle tea and doing nettle tea rinses, a lot of ladies are getting great results from that and I can swear that my hair has started growing faster since I started, so much so that I am going to increase the amount of times per week I do my nettle tea rinses. It makes my hair so soft too!!
I rinse with and drink this: