Herpes simplex Adult & childn >2 yr 200 mg 5 times daily approx 4 hrly, omitting the night dose for 5 days.
Herpes zoster & varicella Adult 800 mg 5 times daily approx 4 hrly, omitting the night dose for 7 days.
Childn >6 yr 800 mg qid for 5 days,
2-6 yr 400 mg qid for 5 days,
<2 yr 200 mg qid for 5 days. Approx dose: 20 mg/kg body wt qid.
Suppressive recurrent genital herpes 200 mg qid or 400 mg bid.