Vikalis VX 40mg is the same medicine as Vikalis VX 20mg, but the active ingredient tadalafil is increased. The drug is used in men who suffer from erectile dysfunction and therefore cannot have an erection. The substances contained in Vikalis VX 40mg (Tadalafil) support the penis with enough blood for a strong erection and prevent premature ejaculation. The sex enhancer is manufactured by Shree Venkatesh and is available in a pack of 10 pills. For treatment, the drug is taken 20 minutes before sex. Its effect lasts up to 36 hours and it is not recommended to exceed the daily dose of a tablet.