Cialis is a modern drug for erectile dysfunction. For many men, Cialis is the best choice in the treatment of sexual weakness. The manufacturer of the drug is Eli Lilly. Cialis has been produced since 2003. It belongs to a group of specific drugs - phosphodiesterase-5 inhibitors. The active substance is Tadalafil. The elliptical pills are covered with a yellowish-orange film shell and have no odor. Cialis is different from other means of potency, and it can be used daily if necessary.