PDE5 inhibitors, such as tadalafil, are a type of drug. It works to treat erectile dysfunction by blocking the action of PDE5 and preventing the breakdown of CGMP in the penis.An increase in CGMP levels leads to easier muscle relaxation, Which increases blood flow and helps build erection.You should take Vidalista tablet 30 minutes before sexual intercourse.The effect lasts for 24 hours.You should not eat heavy food while taking this medicine.