Vidalista 20mg online contains the active ingredient tadalafil. This works similarly to Sildenafil, the active ingredient in Viagra, in that it relaxes blood vessels and increases blood flow in the genitals. Tadalafil (Cialis) is available in a variety of doses as an oral tablet, both generic and brand. Cialis can be taken as needed or once a day, depending on the dose and how it is prescribed. Cialis takes 30 minutes to 2 hours to work. Simply put, tadalafil has the longest duration of action of any PDE5 inhibitor, lasting up to 36 hours or longer in some cases. In comparison, the half-life of sildenafil (Viagra) is approximately 4 hours.
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