The active component of purple viagra pill is sildenafil citrate, a medication that has been approved by the FDA to treat erectile dysfunction in men. This pills aids in boosting blood flow to the male penis's tissues. Take this pills half an hour or thirty minutes before sexual activity for best results. This pills can be taken either before or after meals. This has a four to six day half-life. Alcoholic drinks and fatty meals should not be combined with this pills as they will lessen its effectiveness.