FMT is not the transplant of a single bacterium but the rebuilding of an entire microbial ecosystem — just as a city cannot run on imported engineers alone.
Success is decided before the first capsule: antibiotic washout and preparing the gut environment are the treatment's first active phase, not a mere formality.
Knowing what to expect is part of the treatment: this chapter walks through each delivery method and what sensations count as normal.
In the first week, mild gas, bloating, and changing stool are usually normal signs of colonization — but a few symptoms demand immediate medical help.
Consolidation is a months-long settling process in which diet, sleep, and stress matter as much to a lasting result as the donor preparation itself.
FMT is safe, but a handful of signs — fever, bloody stool, severe abdominal pain, difficulty breathing — call for immediate emergency care.
The step-down phase is not the withdrawal of treatment but its success: as external support tapers, the microbiome learns to sustain itself without reinforcement.