Valif 20 Tablet is used for the treatment of erectile dysfunction in adult men, a condition that causes obscurity in having an erection during sexual intercourse. It works by increasing blood flow to the penis and thereby causing an erection.Valif 20 Tablet may cause side effects such as dizziness, indigestion, headache, sleepiness, skin rash, ascetic mouth, prolonged erections, etc. Consult your doctor if these symptoms persist or worsen.