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It limits the effect of the PDE5 enzyme in the penis, allowing blood vessels in your penis to relax so blood can flow into the penis, helping to get or keep an erection. Keep in mind that Cialis won’t work unless you’re stimulated or aroused. If a doctor has prescribed Cialis for pulmonary arterial hypertension, you may be advised to take two 20-mg doses a day.
You may attempt sexual activity at any time between your doses. Alcohol concentrations (mean maximum blood concentration 0.08 %) were not affected by co-administration with tadalafil (10 mg or 20 mg). In addition, no changes in tadalafil concentrations were seen 3 hours after co-administration with alcohol.
In May 2002, Lilly ICOS reported to the American Urological Association that clinical trial testing demonstrated that tadalafil was effective for up to 36 hours, and one year later, the FDA approved tadalafil. TADALAFIL contains ‘Tadalafil’, which works by relaxing the blood vessels in the penis