Since Discount Cialis approval in the United States in 2003, discount cialis has increased its share of total prescriptions every month in the U.S. For the week ended April 1, 2005, discount cialis held a 24 percent share of new and 22 percent of total U.S. discount cialis treatment prescriptions.Discount cialis approved in November 2003 for the treatment of erectile dysfunction, is the only oral discount cialis shown to improve erectile function up to 36 hours in most men. Discount cialis can be taken without regard to food.