# Herpes simplex (HSV-1 and HSV-2) infections (immunocompromised host) * Adults, children >12 years: IV 5 mg/kg (infuse at constant rate over 1 hour), q8h for 7 days. * Children <12 years: IV 250 mg/m2 (infuse at constant rate for 1 hour), q8h. # Genital herpes * Adults, children >12 years: PO 200 mg q4h, five doses/day; 10 days for initial therapy. Dose for 5 days for intermittent recurrent disease. Administer up to 12 months for chronic disease (suppressive therapy). * Children <12 years: IV 250 mg/m2, t.i.d. for 10 days. # Herpes simplex encephalitis * Adults, children >12 years: IV 10 mg/kg (infuse at constant rate over 1 hour), q8h for 10 days. * Children, 6 months to 12 years: IV 500 mg/m2 (infuse at constant rate over 1 hour), q8h for 10 days. # Herpes zoster * Adults, children >12 years: PO 80 mg, q4h, five doses/day, 7–10 days. * Children <12 years: PO 250–600 mg/m2, 4–5 times/day, 7–10 days. # Chickenpox * Adults, children >40 kg: PO 800 mg, q.i.d. 5 days. * Children >2 years: PO 20 mg/kg q.i.d. (maximum 800 mg), 5 days. | 
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