One powerful medication that is a member of the PDE5 inhibitor class is Tadalista CT 20. Tadalafil, the drug's main ingredient, stimulates the body's natural response to sexual pleasure by increasing blood flow to the penile area. In other words, it helps the blood vessels in the male reproductive organ relax, which in turn helps the blood flow and causes an erection. A heavy meal could delay the onset of the medication's effects. Take tadalafil ideally for 30 minutes, but no more than 36 hours, before engaging in sexual activity. Avoid taking more than once a day. Consult your doctor before taking any additional medications. Tadalista CT 20 should not be taken if you are allergic to tadalafil.