Get finasteride 5 mg from your doc. Cut them into 4 pieces and take once daily. Much cheaper than buying the 1 mg version. It can cause erectile dysfunction although there are some studies out there denying this. It takes about 3 months before you will see significant hair growth results.

Pair it with minoxidil foam twice a day and you'll get the best results. The dropper has some ingredients that cause an allergic reaction so the foam is better. Get it from Costco.