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    TADALAFIL (CIALIS)

    Tadalafil, sold under the brand name Cialis among others, is a medication used to treat erectile dysfunction, benign prostatic hyperplasia, and pulmonary arterial hypertension. It is a tablet taken by mouth. Onset is typically within half an hour and the duration is up to 36 hours. 
    Formula: C22H19N3O4
    CAS ID: 171596-29-5
    Elimination half-life: 17.5 hours
    Bioavailability: Varies
    Metabolism: Liver (predominantly CYP3A4)
    Trade names: Cialis, Adcirca, Cialis, Adcirca, Tadacip, others