How do I restart rifaximin after the regimen is interrupted because of another illness or medication?

It is not unusual to stop rifaximin or the oils because of an illness (e.g., an intestinal virus with vomiting) or other unusual life events (e.g., hospitalization, travel). There is no well-defined method to restart the protocol, but I generally recommend waiting until the intervening event has passed before resuming treatment. Then I would just pick up with everything where I left off. There is no need to slowly add back the different elements of the protocol one by one.