One medicine made especially to treat erectile dysfunction is called Vidalista. Tadalafil, a potent component of the PDE5 inhibitor medication class, is present in the pill. Tadalafil improves blood flow in the penis by relaxing its blood vessels. To get and keep a powerful erection, this increase in blood flow is essential. After taking Vidalista, it usually begins to function 30 to 60 minutes later. Grapefruit juice and alcohol can interact with tadalafil, decreasing its effectiveness or raising the risk of side effects.