Men with erectile dysfunction and impotence can be treated with purple viagra pill. Sildenafil citrate is a component in this medication. This medication is used to improve panel blood flow. You can take this medication any way—before or after food. This medication can be taken with water. This medication should not be chewed. To ensure you and your companion have fun, set aside thirty minutes. This medication takes four to five hours to take effect. For women and children, do not use this medication. You can take this medication as your physician has prescribed.