Cialis helps in certain ways to the males at the time of erection to keep the penis erect at the time when they are sexually excited. Cialis can be said as a modified form of Viagra and it can stay for longer time than Viagra. It has been approved and registered by United states for male impotence. This is available in market of Europe, Australia and in other continents.

It is mainly to treat the problem of erectile dysfunction. There has been no any side effects reported from Viagra or Cialis. Cialis helps in erection by sexual stimulation by improving the blood pressure in the penis. Some of the side effects reported by Cialis are headache due to excess intake, problems in the stomach and some of urinary problems. Cialis is used to stay for the constant period and for longer time.