Yes - both conditions can affect erections. Diabetic men have a higher incidence of erectile prblms, altho usually not right away, it might show up some years after being diagnosed. On the other hand, BP meds are well-known to cause prblms w/ erections. He can ask his Dr. if he can try a different BP med - some are much less likely to cause that unfortunate side effect. Also, this could start very soon after taking the med, possibly even the first time he took it. Hope that helps…