Vilitra 20 works by blocking the enzyme PDE5, which restricts blood flow to the penis. By inhibiting PDE5, Vilitra 20 increases blood flow, facilitating a stronger and longer-lasting erection when sexually stimulated. This medication should be taken about 30 minutes before sexual activity and is not intended for daily use. While effective, users should be aware of potential side effects such as headache, flushing, or dizziness, and always consult their doctor before starting treatment.