<unk>  is a Phosphodiesterase 5 Inhibitor that is FDA approved for the treatment of treatment of erectile dysfunction.   Common adverse reactions include flushing, dizziness, headache, rhinitis.
Vardenafil
Avanafil
Tadalafil
Mesterolone
Sildenafil
Epoprostenol
Levoverbenone
Cloranolol