Some people sometimes have a hard time keeping their penis hard or stiff. However, erectile dysfunction (ED) is often a concern if a satisfactory sexual function is consistently impossible. Doctor Vidalista 40 mg for the treatment of such sexual dysfunction in men. Tadalafil present in this drug works by increasing blood pressure in the arteries of the penis. This medicine should be taken only once in 24 hours. This drug is useful for men 18 and older.