Before Using This medicine: Valtrex has been proven safe for the majority of people. Tell your doctor if you have any kidney disease, blood disorders or if you have any allergies. This medication should be used only if clearly needed during pregnancy. Discuss the risks and benefits with your doctor. It is not known if this medication appears in breast milk. Consult with your doctor before breast-feeding.

Other Medical Problems: Tell your doctor of any over-the-counter or prescription medication you may take including cimetidine or probenecid.

Proper Use of This Medicine: Take one tablet every 12 hours as needed.

Side Effects of This Medicine: If your immune system is not normal because of advanced HIV disease, bone marrow or kidney transplant, tell your doctor to avoid a potentially serious complication. Common side effects are Nausea, vomiting, headache, loss of appetite, weakness, stomach pain or dizziness may occur the first several days as your body adjusts to the medication. If any of these effects continue or become bothersome, inform your doctor. Notify your doctor if your condition does not appear to improve or you experience a worsening of symptoms while taking this medication.