Treatment of herpes zoster 1 g tds for 7 days.
Immunocompromised patient 1 g tds for 7 days & for 2 days following crushing of lesions.
Treatment of herpes simplex 500 mg bd; recurrent episodes: 3-5 days, initial episodes: 10 days.
Immunocompromised patient 1 g bd for 5 days.
Treatment of cold sores 2 g bd for 1 day, 2nd dose in the 12 hr (no sooner than 6 hr) after 1st dose.