SILDENAFIL CITRATE is used when treating male erection there are any noticeable changes in your vision after you started taking this drug, inform your doctor or health care professional at once.Contact you physician right away if the erection lasts for over 4 hours or if it becomes painful at any point. Those may signify serious problems and have to be treated straightaway to prevent permanent damage to your health.If you are experiencing nausea, dizziness, chest pain or arm pain symptoms at any time during sexual activity following taking of this medicine, please refrain from any further activity and refer to your doctor or health care professional ASAP.This medicine usage does not protect you and your partner from HIV infection (the virus causing AIDS) or any other sexually transmitted diseases.Take it orally with a glass of water. The dose should normally be taken 1 hour prior to sexual activity. You should never take it more than once on any given day. Please do not take this medicine more often than prescribed. Overdosage: If you suspect an overdosage, contact the nearest poison control center or emergency room immediately. NOTE: This medicine is only intended your use. Never share it with the others.