Although<unk>  is generally well tolerated, dose dependent adverse effects can occur. The most common adverse effects include headache, flushing, nasopharynigitis, nasal congestion, and back pain. While it is also uncommon, there is a potential for visual disturbances to occur in patients.
Avanafil
Udenafil
Vardenafil
Tadalafil
Telmisartan
Sildenafil
Mesterolone
Norpipanone