Percentage of patients with laboratory abnormalities that were increased or decreased from baseline and were outside of specified ranges. Geriatric Use Of 816 patients with herpes zoster in clinical studies who were treated with Famvir, 248 30. Values represent the minimum number of patients assessed for each laboratory parameter. Continue to take Famvir and talk to your doctor if you experience nausea or vomiting, headache, diarrhea, kobe famvir med mastercard dizziness, tingling in your hands or feet, or itching. Famvir should be started within three days of the onset of shingles symptoms. Penciclovir caused an increased incidence of micronuclei in mouse bone marrow in vivo when administered intravenously at doses highly toxic to bone marrow 500 mg kg but not when administered orally.