Rates of myocardial infarction in men under and 65 and those 65 and older per 1,000(PY) in pre- and post-prescription intervals for an initial prescription for TT or PDE5 inhibitors, with adjusted* rate ratios (RR), ratio of rate ratios (RRR) and 95% confidence limits (CL) by history of heart disease. Here, PDE5A is linked to myocardial infarction.