I'm currently taking 450 mgs Valcyte (just started with no problems) and also 500 mgs Famvir. I know others here take both and I'm wonder what dosage Famvir. My ID doc (who is very main stream and does not get what I'm doing) said stop the Famvir since it does the same as Valcyte. I'm reluctant to do that. I know some here stay on a lower dose Famvir while others are taking much more? What dosages do you guys take?