CKD and Valacyclovir

I recently read that CKD patients should avoid/not take anti viral meds. I have CKD 3A. Are these meds prohibited for occasional oral herpes outbreaks? Because my outbreaks are infrequent (2-4 times per year) I didn't mention my Valacyclovir prescription to my Nephrologist which I now know was a mistake. Any experience/guidance on this would be appreciated as I woke up this morning with a outbreak and of course it's Saturday so not able to consult my Neph.