Sensitivity test results, expressed as the concentration of drug required to inhibit the growth of virus in cell culture by 50% (EC 50), vary greatly depending upon a number of factors including the assay used. Thiopental: (Moderate) Additive CNS depression may occur if general anesthetics are used concomitantly with barbiturates. Replacement therapy: switch to equivalent total daily dose of oral valproate and give at the same dosing interval; titrate according to plasma valproate levels lovegra. Continue to take betaine even if you feel well.