Sildenafil Citrate tablet is contraindicated in patients suffering from heart problems (e.g., angina, chest pain, heart failure, irregular heartbeat, low or high blood pressure). Sildenafil Citrate is contraindicated in patients suffering from severe vision loss, kidney problems, liver problems, blood problems, including sickle cell anemia or leukemia and are allergic to sildenafil or any of the other ingredients of Sildenafil Citrate tablets, deformed penis, have stomach ulcers or bleeding problems.