Vidalista 80 is used to treat erectile dysfunction and premature ejaculation in men. Tadalafil treats ED by relaxing the muscles and allowing more blood flow to the penis. These tablets are a prescription drug for use by men 18 years of age and older. If an overdose of this drug occurs, consult your doctor immediately. Side effects like stomach ache, diarrhoea, persistent cough, change in color vision are seen.