Filagra DXT Plus tablet (Sildenafil Citrate) is prescribed for men aged 18 to 65 years. This medicine is commonly known as Sildenafil citrate and duloxetine and is available as blue pills. Increasing blood flow to the stimulated area is one way in which the drug accomplishes this. The user should take this tablet for about 60 minutes before engaging in sexual intercourse. The medicine takes about 30 minutes to start working and show an effect. You should take this medicine on an empty stomach or with light food so that you can see the effect of this medicine very quickly.