<unk>  is a 5-alpha reductase inhibitor that is FDA approved for the treatment of benign prostatic hyperplasia (BPH).   Common adverse reactions include disorder of breast, prostate specific antigen abnormal, ejaculation disorder, impotence, reduced libido.
Dutasteride
Finasteride
Tadalafil
Ingenol mebutate
Alclometasone
Vardenafil
Oxybutynin 
Cyproterone