Valtrex is used for the treatment of genital herpes. Although, Valtrex is not a permanent cure, it helps heal sores faster and relieves pain and discomfort. Clinically proven to prevent future herpes outbreaks, Valtrex is a once-a-day prescription. In various trial studies, Valtrex impeded outbreaks for up to a year. It works by disrupting the reproduction process of the virus. Moreover, Valtrex prevents the virus spreading to other cells in the body. The prevalently reported adverse effects that may occur with Valtrex are headache, nausea and abdominal pain. Valtrex should only be used by adults with normal immune systems. Prior to using Valtrex, consult a physician. Valtrex may not be prescribed for patients with immune deficiencies, HIV disease, bone marrow or kidney transplant, make sure your doctor knows this to avoid a potentially serious complication.