Speak with your physician and discuss any type of wellness problems you have that might prevent you from securely taking Sildenafil, such as a history of a cardiovascular disease, bleeding ailment, high cholesterol, stroke, belly ulcer, blood cell problems, diabetes, chest discomfort, liver, renal system, or heart condition, blood circulation troubles, uneven pulsation, pulmonary veno-occlusive disease, along with low or higher blood stress.