Thanks for query,
In enteric fever
to prevent relapse you should take antibiotics for about 3-4 weeks.
Due to disturbed intestinal flora by antibiotics & Typhoid your tongue remains coated.Constipation
is also one of the symptom of thyphoid but don't try any laxative as it may complicate typhoid ulcers
You should advised to take Lactobacil preparation with multi vitamin tablets.