Purple Pill Viagra is used in men to treat erectile dysfunction. It contains sildenafil as its main component. Sildenafil improves the blood flow in the male genital organ for sexual arousal, thus maintaining an erection. The effect of this medicine lasts for 4 to 6 hours. Do not break or chew this medicine and take it orally with water. You should take this medicine as advised by your doctor. Do not consume alcoholic beverages or fatty foods with this drug. This drug is only taken by men over 18 years of age.