The maximum dosage of IV Aciclovir is 20 mg/kg every 8 hours. It is recommended that obese patients receive IV aciclovir dosages based on ideal body weight. Aciclovir solutions are administered by slow intravenous infusion (IV) infusion at constant rate over at least 1 hour. Prior to IV infusion, Aciclovir powder for injection must be reconstituted with 10 mL Sterile Water for Injection and then diluted with a compatible IV solution. Infusion concentrations of 7 mg/mL or lower are recommended.