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The IIEF EF domain has a 30-point total score, where higher scores reflect better erectile function. SEP is a diary in which patients recorded each sexual attempt made throughout the study. SEPQuestion 2 asks, "Were you able to insert your penis into the partner's vagina? " SEP Question 3 asks, "Did your erection last long enough for you to have successful intercourse? " The overall percentage of successful attempts to insert the penis into the vagina (SEP2) and to maintain the erection for successful intercourse (SEP3) is derived for each patient. Animal studies showed vascular inflammation in tadalafil-treated mice, rats, and dogs.

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