The drug Purple Pill Viagra is used to treat impotence and erectile dysfunction in men. One ingredient in this drug is sildenafil. This drug facilitates the nerves' blood flow. To increase the amount of time you spend having sex with your partner, take this medication before you start. This medication can be taken with or without food. This medication will not work as well if you take it with cold or fatty foods. This medication can also be taken with water. Adhere to your doctor's instructions when using this medication.