I started taking Acyclovir a few days ago. I have fever blisters in mouth and extremely high EBV titers. My immunologist wants me on it also because I make hardly any lymphocytes and have idiopathic lymphopenia. I used to take Valtrex but have no prescription coverage right now. I know it's very expensive. Valtrex would get rid of fever blisters in a day or 2. Acyclovir is not touching them. I also feel really sick from this med. I am having extreme pain. Or, maybe it's just something else. I have Intercostal Neuralgia. There are not many things that can cause it other than Herpes or Shingles or a trauma to the ribs. I have not had trauma to ribs. I am playing doctor and feeling like it must be from EBV which is a herpes virus like shingles. No doctor thinks like this which makes no sense to me. This just came on out of nowhere and after years of doctor's looking at me and having wide eyes at my titer levels of EBV. Does anyone know if Acyclovir is less strong than Valtrex? My immunologist feels that they are exactly the same in strength. Please share any thoughts of guidance and if you know how to receive Valtrex for less or a good pharmacy for it...also share that. Thank you.