What do systematic reviews say?

Intervention not reported

It is very uncertain whether the intervention changes adverse effects ‐ Disseminated zoster (very low certainty).

• Valacyclovir versus acyclovir for the treatment of herpes zoster ophthalmicus in immunocompetent patients 2016 · Cochrane Headline outcomes only
  RR 0.32 [0.01, 7.73]
  1 study · 110 participants
  Very low