The Effect and Safety of Lisinopril in Non-hypertensive Men With Infertility From Low Sperm Count

"The two groups of patients, A and B, were randomly allocated treatments in a double-blind fashion. Group A was started on the coded drug DY1 while group B was started on the coded drug DZ2. Both DY1 and DZ2 were very identical in appearance. At week 96 the drugs were swopped between the groups such that group A changed to drug DZ2 while group B changed to drug DY1. There was no intervening washout period. The codes were concealed until after the data analysis."