Small intestinal Bacterial Overgrowth(SIBO) can recur after initial course of treatment.So,antibiotic has to be taken in Cycles as per literature.
If at all mucus is coming along with stools,it can be Infection of Large bowel also.Another possibility is Irritable bowel syndrome(IBS
).IBS is closely linked with SIBO.Some studies reported that 80% of patients with IBS have SIBO.
As both the diseases are interlinked,Consult your Gastro enterologist and get correct course of Antibiotic course.
Dont worry.It will be completely cured.