I've been having very strange and vivid dreams since i started taking valacyclovir is that normal?

Yes, rare: On sep, 17, 2013: 14, 459 people reported to have side effects when taking valtrex. Among them, 39 people (0.27%) have dreams - bad. Realize that this is 0.27% of reported side effects, not 0.27% of the population that takes the drug, which is much greater. However, the dreams were listed as bad.Source: www.Ehealthme.Com/ds/valacyclovir/dreams+-+bad.