purple viagra is one medicine used to treat impotence. This drug is very beneficial and effective for erectile dysfunction. The blood flow to men's penile tissues is improved by this medication. One of the ingredients in this medication, sildenafil, helps men get an erection during sex. In order to spend quality time with your partner, take this medication 30 minutes before engaging in sexual activity. This medicine can be taken with or without food. When taking this medication, heed the advice of your physician. This drug has a half-life of thirty-six hours.