If the OP is being truthful that he took 150mg AND Duasteride and still had no side effects and just had hair growth then he is in the minority. The issue with spironolactone and other oral antiandrogens are, aside from side effects, they are not a long term solutions. You are not going to take Spironolactone forever. The only Androgen related drug that has been proven to be relatively safe long term (though many would disagree) is Finasteride. All other drugs, including daily use of Duasteride, have the potential to cause side effects such as bone loss, muscle loss, lipid dysfunction, glucose issues, etc.