Hi mojo,
Yes BP meds can have side effects which include difficulty maintaining or getting erections. I have been on Toprol XL for several years , as a beta blocker, however it is also widely used for BP. While I had some minor problems maintaining erections before being place on this drug,the last several months I was not able to complete sex because of loss of erection. When I informed my Dr of this we tried a few other meds, but no improvement. He said he wasn't sure if was because of the meds, heart disease, or just advancing age (I'm only 53), and put me on Viagra, which has definatly worked.
My advice to you would be to talk to your Dr and let him know of this problem, and hopefully you can get this problem taken care of.
Good luck