DD was on high doses of antibiotics for a month following and accident. The problem wasn't withdrawal symptoms as much as the antibiotics completely messed with her internal biome, killing off internal bacteria needed for a healthy gut.
She ended upwith food intolerances and all the problems of a disturbed digestion system.After a year if taking prebiotics and the probiotics available from places like Holland and Barrett and similar without effect, she spoke to her local pharmacist who recommended a product called Symprove, which I think is now available on prescription, but wasn't then. It was expensive and a three month course but it worked wonders and she is now back to normal.