Viagra Super Active+ (Sildenafil)
Drug UsesIn 2000, Viagra sales took a clean sweep for 92% of the market for erectile dysfunction pills prescriptive eréctil.8 In 2007, revenues decreased to 50% due to competition with other drugs such as tadalafil (marketed as Cialis) and vardenafil (Levitra), 9 as well as their own fakes and copies, and the appearance of testimonies of patients suffering from vision loss to use PDE5 inhibitors (see section on Mechanism of Action) 10 11 In February 2007, the company announced that Boots the Chemist had conducted a study to assess the direct sales in pharmacies without a prescription. The study was done in Manchester (England) and was aimed at men aged between 30 and 65, who bought four tablets after a consultation with a farmacéutico.12 The global patent sildenafil citrate will expire between 2011 and 2013.13 The patent held by Pfizer in the UK for the use of phosphodiesterase 5 (PDE5) as treatment of impotence was invalidated in 2000 because it was felt that claimed to have all patent from pharmaceutical group a product of the family. This decision was kept in an appeal in 2002.14 15








