* Porst et al., European Urology (2006). Randomized trial of 268 men with erection difficulties across placebo, 5 mg and 10 mg groups. Secondary, patient-reported measure. This result is for the 5 mg group; Matador Daily was not the study product. Study doses are not instructions for use. Results vary. Comparison for the 84.5% result: Men taking tadalafil 5 mg daily reported improved erections after 12 weeks, compared with 28.3% on placebo. For 85.9%: Original source. Shabsigh et al., International Journal of Impotence Research (2010), published online August 6, 2009, abstract Results. Pooled analysis of two randomized trials: tadalafil 5 mg group n=206, 2.5 mg n=96, placebo n=148. After an initial success, subsequent successful intercourse attempts were 85.9% with 5 mg daily versus 70.2% with placebo. This is a conditional attempt-success proportion, not 85.9% of all men or a first-attempt rate. Duration of the pooled trials is not stated in the abstract; no timeframe assigned to this card. Separate analysis from the 12-week 84.5% result.