Treatment with famciclovir should be started as soon as possible after the first appearance of symptoms such as tingling, burning, blisters. For maximum Famvir should be administered within the first 48 hours after the appearance of shingles or the first symptom of genital herpes. Although each person is different, kaufen famvir kostenlose beratung common early symptoms may include pain, burning, itching, tingling, or tenderness. No famciclovir dosage adjustment based on gender is recommended. If you are using probenecid, you may not be able to use Famvir, or you may need dosage adjustments or special tests during treatment. This medication works best when the amount of drug in your body is kept at constant level.