From a study, "Before engaging in sexual activity, 1,328 patients took the medication. As measured by the findings of one of the surveys, which asked men to rank their condition on an eight-point scale ranging from 0-to-30, the patients' scores improved from 15 to 23 and 25 after taking the medication Tadalafil Lilly 10 or 20 mg, respectively. Tadalafil Lilly was administered once daily to 853 individuals in the other three investigations. Patients taking Tadalafil Lilly had better erections than those on placebo, according to the study data."