Treat viral infections like shingles, cold sores and genital herpes. Take this medicine exactly as directed by the doctor. You may experience side effects like headache, nausea, dizziness and sensitivity to light.
Adult: Immunocompetent patients: 500 mg bid for 3-5 days for recurrent episodes or for up to 10 days for initial episodes. Immunocompromised patients: 1,000 mg bid for at least 5 days for recurrent episodes or for up to 10 days for initial episodes. Treatment duration is based on severity of clinical condition and immunological status.
Child: ≥12 years Same as adult dose.
Suppression of recurrent herpes simplex
Adult: Immunocompetent patients: 500 mg once daily. Patient with ≥10 relapses a year: 250 mg bid. Immunocompromised patients: 500 mg bid. Re-evaluate treatment after 6-12 months of therapy.