Cheap cialis tablets can be an effective tool to restore men's sexual life. To such conclusion came American scientists from Georgia Health Sciences University. Talking about the drug called Metformin, which is widely used in the treatment of type 2 diabetes. American scientists have found that these pills can also be an effective treatment for erectile dysfunction, since they have almost the same effect as Viagra or Cialis. Laboratory tests showed that Metformin improves erection by relaxing the blood vessels in the genital area. And thus the blood flows more freely to the penis.