<unk> , as with all PDE5 inhibitors, should not be used by people taking nitrate medications, because combining them with<unk>  might provoke potentially life-threatening hypotension (low blood pressure). Further,<unk>  causes lengthening of the QT interval. Therefore, it should not be taken by people taking other medications that affect the QT interval (such as amiodarone).
Vardenafil
Avanafil
Udenafil
Tadalafil
Mesterolone
Telmisartan
Sildenafil
Norpipanone