Geriatric Use Of the total number of subjects in clinical studies of VALTREX, 906 were 65 and over, and 352 were 75 and over. Mcg mL in patients with hepatic dysfunction, renal insufficiency, and in healthy volunteers who received concomitant cimetidine and probenecid, respectively. If you are sexually active, you can still pass herpes to your partner, even if you are taking VALTREX. Tell your doctor kobe valacyclovir uden rx immediately if any of these rare but very serious side effects occur: seizures, loss of consciousness, signs of other infections. It can spread to almost everywhere else on the body and may be accompanied by flu-like symptoms. You may need dose adjustments or special tests when taking certain medications together with valacyclovir. MedicineNet provides reliable doctor produced health and medical information.