Cellcept Dosage 2g Vs 3g in Sclero Forums (MAIN) Posted January 4, 2007 I've been on 2g for a year. I'll be asking to go up to 3g at my appt on the 30th regardless of my PFT's because of the increase in my other symptoms. I'm worried that because my other symptoms have increased, my PFT's will have decreased. Good question because I have wanted to know how common a 3g dosage is too. I have also noticed that a lot of lupus patients have started on Cellcept.