If you want to use Valtrex suppressively,you need to take 500 mg once a day around the same time each day. It takes five days for the medicine to work fully to protect a partner but remember that ab out 50% of people already have HSV 1, so you are safe to have sex with someone who is also HSV 1 positive. If you take suppression for 90 days, you can stop it but not sure why you would?
Terri