All I can tell you is, my hepatologist told me not to take it while I was treating. I know it weakens your immune system, can raise your BP (and so can Sofosbuvir), etc.
I would consult with your physician and the prescribing pharmacist for Sofosbuvir. Gilead's support will not be of much help. They will read you a list of known contraindications but will not advise on specific medications as you're inquiring about.