The valtrex (valacyclovir) prescription for the treatment of my cold sores is1 gm. i took it twice for one day at an interval of 12 hours. istill have a big enough cold sore on my lip. should i continuetaking it?

Early application!: That's a typical prescription. It works best when taken at the first sign of the outbreak. It is not a miracle drug. It merely helps the sores heal faster, keeps new sores from forming, and decreases pain/itching. This medication may also help reduce how long pain remains after the sores heal.

One day treatment: Is not long enough. Usually 5-7 day rx should do the job.

Wrong dosage: Its 2 grams twice a day for one day actually.

May not be Herpes: Valtrex (valacyclovir) will not treat anything other than herpes simplex infection, and if not started immediately after onset may take a while to be effective, if at all.