The is Valif 20 mg Tablet, one of the best prescription-based drugs for treating men with impotence. The Vardenafil Valif 20, also known as Cialis, is being consumed by millions of men worldwide of all age groups who want an active sex life. Cialis manufactured by Eli Lilly in Australia, Canada, New Zealand, the United Kingdom, the United States — and other countries. One tablet a day is enough to achieve and sustain a harder erection for a period of up to 36 hours and forget about the erectile dysfunction issues. It takes around 30 minutes to show its effect.