Zudena is another representative of the PDE5 inhibitors ubiquitously used in contemporary urology. It is commonly used for the therapy and prevention of erectile dysfunction. The pills contain udenafil – a reverse inhibitor of the phosphodiesterase-5, which is responsible for filling the penis with blood. This active ingredient has a range of recently introduced advantages the most notable of which are more rapid absorption (30-60 minutes) and increased half-life (starting from 10 to 12 hours, which leads to a 24-hour period of activity). The medicine may be prescribed not only for symptomatic but also for a long-term treatment.