I am somewhat different than most. I started Valcyte 1800mg At the end of the 4th day I opened my eyes wide and said (out loud) "I feel different". And many of my autonomic symptoms started to improve. After 2 weeks, the dose was reduced to 900mg and I went downhill. Later back up to 1800mg and the very same routine. At the end of the 4th day "I feel different". I have been on that dose for 10 days and better each day. But we are waiting for blood test results on my liver (may be a problem). If so, back to a lower dose.
Everyone I have heard of has to be on it for months, although Jennifer Brea (Unrest) took Valcyte and her movie implied that she had very fast improvement.