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Tadalafil, commonly known as Cialis, is the phosphodiesterase inhibitor indicated for daily use in the treatment of erectile dysfunction, particularly for individuals who anticipate engaging in sexual activity multiple times per week. This medication has a unique pharmacokinetic profile that allows for prolonged action, with effects lasting up to 36 hours after a single dose. This extended duration of action makes it particularly advantageous for those who prefer spontaneity in sexual activity without the need to plan around taking a medication shortly before, as would be necessary with other phosphodiesterase inhibitors that have shorter action times.

In contrast, medications such as Vardenafil (Levitra), Sildenafil (Viagra), and Avanafil (Stendra) are typically recommended for use on an as-needed basis. These alternatives have shorter half-lives, necessitating dosing shortly before sexual activity for optimal effectiveness, which could be less convenient for individuals engaging in sexual activity frequently. Thus, Tadalafil's formulation allows for flexibility and convenience, accommodating a more frequent sexual activity schedule.