Herpes simplex infections 200 mg 5 times daily for 5-10 days.
Suppression of herpes simplex infections 200 mg 2-5 times daily for up to 6-12 mth or 400 mg bd.
Prophylaxis of herpes simplex infections in immune-compromised patient 200 mg qds, may be doubled in severely immune-compromised patient or patient w/ impaired gut absorption.
Varicella & herpes zoster infections 800 mg 5 times daily for 7-10 days.