I take aciclovir every couple of months for , um, ehem, well, you can guess I'm sure. Of course every single doctor I talked to before donation knew this and it is currently not on the list of medications that are known to cause kidney damage. I was told to take it regularly when needed.
FYI, L-lysine is ok and works better than nothing, but aciclovir is by far more effective, by a long long long shot.
Fun Fact: NSAIDS is linked to kidney damage because they cause the blood vessel leading to the kidney to restrict which means the kidney receives less blood.