If you are antipathetic to sildenafil or any other element of Suhagra 50 tablet. If you are taking riociguat which is used in the action of arterial blood pressure. Still, please confirm with your croaker, if you are not sure what this medicine is. If you have heart conditions like stroke or heart attack. If you have liver conditions. If you ever had a loss of vision or have a certain eye condition like retinitis colours. If you are taking certain medicines (nitrates) which can lead to a drop in blood pressure.