If you are:
No Known Risk: LIMITED DATA SUGGEST LOW LEVELS EXCRETED RESULTING IN NO ADVERSE EFFECTS
An adult over 60:
management or monitoring precaution: Renal-Dose interval adjustment necessary for CrCL<25 mL/min. for high dose (800 mg) treatment. Renal toxicity more common in the elderly. Neuro/Psych-Dizziness, somnolence, hallucinations, confusion and coma are reported more commonly in the elderly.
Giving acyclovir to a child under 12:
management or monitoring precaution: IV route preferred. Safety and efficacy of oral route not established age < 2 years. Rare use for immunocompromised patients in treating zoster or varicella.