purple viagra helps men to achieve a strong erection during sexual intercourse. This tablet is a medicine used to treat erectile dysfunction and impotence. The active ingredient in purple viagra is Sildenafil Citrate, which helps men achieve strong erections during sexual intercourse. Take this tablet 30 minutes before sexual intercourse so you can enjoy sexual intercourse with your significant other. You can take it before or after eating. Take it with water. Do not chew or break the medicine. Do not eat fatty foods. Do not drink cold drinks. Take it as directed by your doctor.