https://en.wikipedia.org/wiki/Valaciclovir

The less frequent side effects of aciclovir raw are interesting. Likewise for the prodrug valaciclovir (Valtrex). Some of these sound like they're a result of some level of impact on brain function. I can't help but wonder if there's any relation.

But you're right. The adverse effects here don't seem like much of a deterrent in the face of elevated risk.