Valacyclovir dosing. The recommended Valacyclovir dosing guidelines vary, depending on your age, other medical conditions you have, and medications you are taking. The recommended dosage for shingles is 1000 mg, three times a day, for seven days. To treat cold sores, the recommended dose is 2000 mg, twice a day, for one day. Dosing guidelines for genital herpes will depend on whether it is the first outbreak, a recurrent outbreak, or used to prevent future outbreaks. For treating chickenpox, the dosage will depend on the child’s weight.
How to take Valacyclovir. Take valacyclovir exactly as it was prescribed for you. Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended. Start taking valacyclovir as soon as possible after the first appearance of symptoms (such as tingling, burning, blisters). This medicine might not be as effective if you first start taking it 1 or 2 days after the start of your symptoms.